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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Funds Withheld At Interest Embedded Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ (3,329) $ (20,194) $ 22,094 $ (176,270)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 [1] 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [1] 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [1] 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value (49,498) 36,617 (49,498) 36,617        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 0 0        
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Funds Withheld At Interest Embedded Derivatives [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (46,169) 56,811 (71,592) 212,887        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (46,169) 56,811 (71,592) 212,887        
Funds Withheld At Interest Embedded Derivatives [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Funds Withheld At Interest Embedded Derivatives [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Funds Withheld At Interest Embedded Derivatives [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Funds Withheld At Interest Embedded Derivatives [Member] | Other Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Nonredeemable Preferred Stock [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   0   0       $ (4,962)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 12,388   7,904          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (396)   (412)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases [1] 0   (4,529)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales [1] 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements [1] 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 11,992   11,992          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3       (4,962)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0   (29)          
Nonredeemable Preferred Stock [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Nonredeemable Preferred Stock [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Nonredeemable Preferred Stock [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Nonredeemable Preferred Stock [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Nonredeemable Preferred Stock [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Nonredeemable Preferred Stock [Member] | Other Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Longevity Swap [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   (4,407)   (4,407)       0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 10,853 0 7,727          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 41 (92) (565)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 13,298 4,407 13,298 4,407        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)       (92)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 0          
Longevity Swap [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Longevity Swap [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Longevity Swap [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Longevity Swap [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Longevity Swap [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       0        
Longevity Swap [Member] | Other Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 2,404 4,499 6,136          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       (4,499)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 2,404 4,499 6,136          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       (4,499)        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (1,106,410) (1,017,927) (1,106,410) (1,017,927) $ (1,069,154) $ (1,085,166) $ (940,236) (868,725)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases (9,333) [1] (11,912) (34,901) [1] (41,321)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 [1] 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 17,205 [1] 17,351 54,286 [1] 55,217        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 0 0 0        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (97,696) (48,677) (77,338) (78,834)        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (95,373) (47,479) (69,628) (76,323)        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (33,040) (53,001) (25,288) (141,992)        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (50,245) (35,651) 0 (86,775)        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 (28,999) 0        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Other Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Mortality Swap [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (2,196) (320) (2,196) (320) $ (1,754) $ 797 $ 0 $ 0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 0 0 0        
Mortality Swap [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Mortality Swap [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Mortality Swap [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Mortality Swap [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Mortality Swap [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Mortality Swap [Member] | Other Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (442) (320) (1,399) (320)        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (442) (320) (1,399) (320)        
Available-for-sale Securities [Member] | Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,237,317 1,287,940 1,310,427 1,345,289        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1,125) (13,424) (11,958) (4,888)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases (66,137) [1] (180,319) (180,019) [1] (312,380)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [1] (590) (3,949) [1] (48,266)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (47,248) [1] (76,968) (210,544) [1] (177,914)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 3,050 3,327 3,463 10,257        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,247,690 1,377,004 1,247,690 1,377,004        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (9,515) 2,161 (16,417) (56,035)        
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (841) (1,335) (2,641) (3,671)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (891) (1,332) (2,745) (3,718)        
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (35) (107) (606) (101)        
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Residential mortgage-backed securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 298,376 185,547 188,094 153,505        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 829 (462) 61 2,793        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases (86,748) [1] (16,395) (217,055) [1] (48,543)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (271) [1] 0 (985) [1] (744)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (12,263) [1] (16,104) (26,599) [1] (28,676)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 453 2,211 2,853 13,675        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 369,667 187,502 369,667 187,502        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (3,684) 0 (9,930) (1,744)        
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (378) (121) (675) (28)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (378) (122) (674) (24)        
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (143) 37 (208) 174        
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Asset-backed securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 580,510 556,160 572,960 471,848        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (3,924) (1,116) (593) 4,898        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases (57,120) [1] (24,152) (142,292) [1] (148,260)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (174) [1] (2,053) (9,145) [1] (22,923)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (26,776) [1] (30,104) (94,649) [1] (42,737)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 9,055 11,614        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 604,203 544,632 604,203 544,632        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (4,427) (5,066) (20,877) (34,346)        
Available-for-sale Securities [Member] | Asset-backed securities | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 373 1,689 2,478 3,694        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1,609 1,919 4,539 6,031        
Available-for-sale Securities [Member] | Asset-backed securities | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 265 740 621 1,987        
Available-for-sale Securities [Member] | Asset-backed securities | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Asset-backed securities | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Asset-backed securities | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 77,819 97,914 86,746 101,785        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1,265) (2,248) (1,961) 2,426        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 [1] (6,180) (42) [1] (6,180)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (3,197) [1] 0 (6,153) [1] (14,626)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1,144) [1] (1,315) (7,157) [1] (1,858)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 12,828 5,712        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 72,643 95,519 72,643 95,519        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 (5,542) (12,720) (5,541)        
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 841 523 2,070 1,398        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 896 523 2,167 1,342        
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (466) 7 (1,149) 99        
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | US Treasury And Government Member                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 27,359   28,529          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 200   (183)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases [1] (157)   (432)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales [1] 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements [1] (267)   (1,305)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 27,320   27,320          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0   0          
Available-for-sale Securities [Member] | US Treasury And Government Member | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (92)   1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (92)   1          
Available-for-sale Securities [Member] | US Treasury And Government Member | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (37)   (154)          
Available-for-sale Securities [Member] | US Treasury And Government Member | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Available-for-sale Securities [Member] | US Treasury And Government Member | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Available-for-sale Securities [Member] | US Treasury And Government Member | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0          
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 40,186   42,711 43,776        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1,164)   (2,619) 2,875        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases [1] 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [1]   0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (30) [1]   (271) [1] (532)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0   0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 38,994 42,505 38,994 42,505        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0   (835) (3,633)        
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 7   22          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 7   22 31        
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (5)   (14) (12)        
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0 0        
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0 0        
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0   0 0        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 14,657 10,888 19,663 37,997        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 273 (72) 223 (40)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 [1] 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [1] 0 0 [1] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (316) [1] (304) (939) [1] (903)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 14,614 10,512 14,614 10,512        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 (4,333) (26,542)        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Other Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings $ 0 0 $ 0 0        
Available-for-sale Securities [Member] | US Treasury And Government Member                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   32,994   40,919        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (115)   762        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   (167)   (460)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (2,461)   (11,024)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   30,388   30,388        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   0   0        
Available-for-sale Securities [Member] | US Treasury And Government Member | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   (134)   (416)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (134)   (416)        
Available-for-sale Securities [Member] | US Treasury And Government Member | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (63)   (313)        
Available-for-sale Securities [Member] | US Treasury And Government Member | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0   0        
Available-for-sale Securities [Member] | US Treasury And Government Member | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0   0        
Available-for-sale Securities [Member] | US Treasury And Government Member | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0   0        
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   45,767            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   431            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (66)            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   42,505   42,505        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   (3,632)            
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Investment Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   9   31        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   9            
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Gain (Loss) on Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (4)            
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Insurance Claims [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0            
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Interest Income [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0            
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   $ 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   $ 0            
[1] The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.