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Fair Value (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair value transfers due to changes in available market observable inputs    
Transfers from level 1 to level 2 $ 0 $ 0
Transfers from level 2 to level 1 0 0
Level 3    
Roll forward of Level 3 consolidated fair value measurements on a recurring basis    
Beginning balance 9,352 8,646
Included in earnings (85) 177
Included in other comprehensive income (41) 105
Purchases 7,154 22,657
Sales (5,411) (1,908)
Transfers into Level 3 11,196 9,646
Transfers out of Level 3 (12,086) (29,971)
Ending balance 10,079 9,352
Level 3 | Available-for-sale securities    
Roll forward of Level 3 consolidated fair value measurements on a recurring basis    
Beginning balance 9,352 8,646
Included in earnings (85) 177
Included in other comprehensive income (41) 105
Purchases 7,154 22,657
Sales (5,411) (1,908)
Transfers into Level 3 11,196 9,646
Transfers out of Level 3 (12,086) (29,971)
Ending balance 10,079 9,352
Level 3 | Fixed maturities | Available-for-sale securities    
Roll forward of Level 3 consolidated fair value measurements on a recurring basis    
Beginning balance 9,352 8,646
Included in earnings (85) 177
Included in other comprehensive income (41) 105
Purchases 7,154 22,657
Sales (5,411) (1,908)
Transfers into Level 3 11,196 9,646
Transfers out of Level 3 (12,086) (29,971)
Ending balance 10,079 9,352
Level 3 | Corporate debt securities | Available-for-sale securities    
Roll forward of Level 3 consolidated fair value measurements on a recurring basis    
Beginning balance 9,352 69
Included in earnings (85) 173
Included in other comprehensive income (41) 107
Purchases 4,954 13,935
Sales (5,411) (1,854)
Transfers into Level 3 11,196 7,532
Transfers out of Level 3 (12,086) (10,610)
Ending balance 7,879 9,352
Level 3 | Commercial mortgage-backed securities | Available-for-sale securities    
Roll forward of Level 3 consolidated fair value measurements on a recurring basis    
Beginning balance 0 0
Included in earnings   0
Included in other comprehensive income   3
Purchases   1,000
Sales   0
Transfers into Level 3   0
Transfers out of Level 3   (1,003)
Ending balance   0
Level 3 | Collateralized debt obligations | Available-for-sale securities    
Roll forward of Level 3 consolidated fair value measurements on a recurring basis    
Beginning balance 0 8,577
Included in earnings 0 4
Included in other comprehensive income 0 (5)
Purchases 2,200 7,722
Sales 0 (54)
Transfers into Level 3 0 2,114
Transfers out of Level 3 0 (18,358)
Ending balance $ 2,200 $ 0