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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
U.S. Government and federally sponsored agency obligations:    
Carrying Amount $ 6,859,967 $ 6,313,189
Fair Value 6,859,967 6,313,189
Investments, Carrying Amount 7,089,680 6,539,473
Separate Account (variable annuity) assets 1,814,152 [1] 1,747,995 [1]
Separate Account (variable annuity) assets, Fair Value 1,814,152 [1] 1,747,995 [1]
Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 6,676,339 6,009,573
Fair Value 6,676,339 6,009,573
Short-term investments [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investments, Carrying Amount 68,458 206,758
Investments, Fair Value 68,458 206,758
Mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 582,132 569,725
Fair Value 582,132 569,725
Other, including U.S. Treasury Securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 476,178 435,574
Fair Value 476,178 435,574
Municipal bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 1,597,889 1,471,527
Fair Value 1,597,889 1,471,527
Foreign government bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 57,039 54,951
Fair Value 57,039 54,951
Corporate bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 2,863,737 2,614,409
Fair Value 2,863,737 2,614,409
Other mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 1,099,364 863,387
Fair Value 1,099,364 863,387
Equity securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 109,462 91,858
Fair Value 109,462 91,858
Other Investment [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investment In Federal Home Loan Bank Stock Carrying Value 5,708 5,000
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 5,708 5,000
Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value 6,915 0
Financial Liabilities Other policyholders funds, embedded derivatives, Carrying Value 6,915 0
Level 1 [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 177,329 308,571
Separate Account (variable annuity) assets, Fair Value 1,814,152 [1] 1,747,995 [1]
Level 1 [Member] | Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 28,453 27,938
Level 1 [Member] | Short-term investments [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 68,055 206,354
Level 1 [Member] | Mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Other, including U.S. Treasury Securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 17,854 17,757
Level 1 [Member] | Municipal bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Foreign government bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Corporate bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 10,599 10,181
Level 1 [Member] | Other mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Equity securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 80,821 74,279
Level 1 [Member] | Other Investment [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 0 0
Level 1 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value 0 0
Level 2 [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 6,543,130 5,895,083
Separate Account (variable annuity) assets, Fair Value 0 [1] 0 [1]
Level 2 [Member] | Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 6,508,384 5,872,106
Level 2 [Member] | Short-term investments [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 403 404
Level 2 [Member] | Mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 582,132 569,725
Level 2 [Member] | Other, including U.S. Treasury Securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 458,324 417,817
Level 2 [Member] | Municipal bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,584,835 1,468,833
Level 2 [Member] | Foreign government bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 57,039 54,951
Level 2 [Member] | Corporate bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 2,779,212 2,543,402
Level 2 [Member] | Other mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,046,842 817,378
Level 2 [Member] | Equity securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 28,635 17,573
Level 2 [Member] | Other Investment [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 5,708 5,000
Level 2 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value 0 0
Level 3 [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 139,508 109,535
Separate Account (variable annuity) assets, Fair Value 0 [1] 0 [1]
Level 3 [Member] | Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 139,502 109,529
Level 3 [Member] | Short-term investments [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 0 0
Level 3 [Member] | Mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 3 [Member] | Other, including U.S. Treasury Securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 3 [Member] | Municipal bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 13,054 2,694
Level 3 [Member] | Foreign government bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 3 [Member] | Corporate bonds [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 73,926 60,826
Level 3 [Member] | Other mortgage-backed securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 52,522 46,009
Level 3 [Member] | Equity securities [Member]
   
U.S. Government and federally sponsored agency obligations:    
Fair Value 6 6
Level 3 [Member] | Other Investment [Member]
   
U.S. Government and federally sponsored agency obligations:    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 0 0
Level 3 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
   
U.S. Government and federally sponsored agency obligations:    
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value $ 6,915 $ 0
[1] Separate Account (variable annuity) liabilities are set equal to Separate Account (variable annuity) assets.