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Fair Value of Financial Instruments - Schedule of Changes in Balances of Level 3 Financial Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Changes in balances of Level 3 financial assets    
Balance at beginning of period $ 196,016 $ 250
Total realized/unrealized net earnings (loss)   (1,288)
Total realized/unrealized other comp. income (loss)   (644)
Purchases and issuances   198,198
Sales and settlements   (500)
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   196,016
Changes in balances of Level 3 financial liabilities    
Balance at beginning of period 4,332 0
Total realized/unrealized net earnings (loss) 7,825 0
Total realized/unrealized other comp. income (loss) 0 0
Purchases and issuances 4,485 4,332
Sales and settlements (357) 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Balance at end of period 16,285 4,332
Derivative    
Changes in balances of Level 3 financial liabilities    
Balance at beginning of period 4,332 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   0
Purchases and issuances   4,332
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   4,332
Warrant liability    
Changes in balances of Level 3 financial liabilities    
Balance at beginning of period 4,332  
Total realized/unrealized net earnings (loss) (274)  
Total realized/unrealized other comp. income (loss) 0  
Purchases and issuances 0  
Sales and settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period 4,058 4,332
Contingent liability    
Changes in balances of Level 3 financial liabilities    
Balance at beginning of period 0  
Total realized/unrealized net earnings (loss) 8,773  
Total realized/unrealized other comp. income (loss) 0  
Purchases and issuances 2,995  
Sales and settlements (357)  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period 11,411 0
Other    
Changes in balances of Level 3 financial liabilities    
Balance at beginning of period 0  
Total realized/unrealized net earnings (loss) (674)  
Total realized/unrealized other comp. income (loss) 0  
Purchases and issuances 1,490  
Sales and settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period 816 0
Fixed maturity securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 186,873 250
Total realized/unrealized net earnings (loss)   256
Total realized/unrealized other comp. income (loss)   (16)
Purchases and issuances   186,883
Sales and settlements   (500)
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   186,873
U.S. Government and government agencies    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 73 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   (1)
Purchases and issuances   74
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   73
States, municipalities and political subdivisions    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 5,659 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   7
Purchases and issuances   5,652
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   5,659
Foreign government    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 0 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   0
Purchases and issuances   0
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   0
Residential mortgage-backed securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 79,019 0
Total realized/unrealized net earnings (loss)   301
Total realized/unrealized other comp. income (loss)   (166)
Purchases and issuances   78,884
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   79,019
Commercial mortgage-backed securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 60,525 0
Total realized/unrealized net earnings (loss)   (45)
Total realized/unrealized other comp. income (loss)   197
Purchases and issuances   60,373
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   60,525
Asset-backed securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 27,653 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   0
Purchases and issuances   27,653
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   27,653
Corporate and other    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 13,944 250
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   (53)
Purchases and issuances   14,247
Sales and settlements   (500)
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   13,944
Equity securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 4,932 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   0
Purchases and issuances   4,932
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   4,932
Common stocks    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 4,932 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   0
Purchases and issuances   4,932
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   4,932
Perpetual preferred stocks    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 0 0
Total realized/unrealized net earnings (loss)   0
Total realized/unrealized other comp. income (loss)   0
Purchases and issuances   0
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Balance at end of period   0
Securities (Assets)    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 196,016  
Total realized/unrealized net earnings (loss) (2,242)  
Total realized/unrealized other comp. income (loss) 727  
Purchases and issuances 75,970  
Sales and settlements (67,063)  
Transfer into Level 3 45,910  
Transfer out of Level 3 (42,653)  
Balance at end of period 206,665 196,016
Securities (Assets) | Fixed maturity securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 186,873  
Total realized/unrealized net earnings (loss) (1,506)  
Total realized/unrealized other comp. income (loss) 1,084  
Purchases and issuances 72,748  
Sales and settlements (64,179)  
Transfer into Level 3 45,910  
Transfer out of Level 3 (42,653)  
Balance at end of period 198,277 186,873
Securities (Assets) | U.S. Government and government agencies    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 73  
Total realized/unrealized net earnings (loss) 0  
Total realized/unrealized other comp. income (loss) 2  
Purchases and issuances 0  
Sales and settlements (43)  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period 32 73
Securities (Assets) | States, municipalities and political subdivisions    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 5,659  
Total realized/unrealized net earnings (loss) 401  
Total realized/unrealized other comp. income (loss) (370)  
Purchases and issuances 0  
Sales and settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period 5,690 5,659
Securities (Assets) | Residential mortgage-backed securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 79,019  
Total realized/unrealized net earnings (loss) (1,928)  
Total realized/unrealized other comp. income (loss) 1,374  
Purchases and issuances 0  
Sales and settlements (14,656)  
Transfer into Level 3 16,878  
Transfer out of Level 3 (24,733)  
Balance at end of period 55,954 79,019
Securities (Assets) | Commercial mortgage-backed securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 60,525  
Total realized/unrealized net earnings (loss) (958)  
Total realized/unrealized other comp. income (loss) 275  
Purchases and issuances 0  
Sales and settlements (21,548)  
Transfer into Level 3 12,515  
Transfer out of Level 3 (7,791)  
Balance at end of period 43,018 60,525
Securities (Assets) | Asset-backed securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 27,653  
Total realized/unrealized net earnings (loss) 963  
Total realized/unrealized other comp. income (loss) 1,413  
Purchases and issuances 59,379  
Sales and settlements (23,457)  
Transfer into Level 3 14,426  
Transfer out of Level 3 (7,160)  
Balance at end of period 73,217 27,653
Securities (Assets) | Corporate and other    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 13,944  
Total realized/unrealized net earnings (loss) 16  
Total realized/unrealized other comp. income (loss) (1,610)  
Purchases and issuances 13,369  
Sales and settlements (4,475)  
Transfer into Level 3 2,091  
Transfer out of Level 3 (2,969)  
Balance at end of period 20,366 13,944
Securities (Assets) | Equity securities    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 4,932  
Total realized/unrealized net earnings (loss) 0  
Total realized/unrealized other comp. income (loss) (357)  
Purchases and issuances 0  
Sales and settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period 4,575 4,932
Securities (Assets) | Common stocks    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 4,932  
Total realized/unrealized net earnings (loss) 0  
Total realized/unrealized other comp. income (loss) (357)  
Purchases and issuances 0  
Sales and settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period 4,575 4,932
Derivative    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 4,211 0
Total realized/unrealized net earnings (loss) (580) (1,544)
Total realized/unrealized other comp. income (loss) 0 (628)
Purchases and issuances 230 6,383
Sales and settlements (48) 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Balance at end of period 3,813 4,211
Contingent Asset    
Changes in balances of Level 3 financial assets    
Balance at beginning of period 0  
Total realized/unrealized net earnings (loss) (156)  
Total realized/unrealized other comp. income (loss) 0  
Purchases and issuances 2,992  
Sales and settlements (2,836)  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Balance at end of period $ 0 $ 0
Level 3 | Assets, Total    
Changes in balances of Level 3 financial liabilities    
Percentage of total assets (less than) 1.00%