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Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair value transfers due to changes in available market observable inputs        
Transfers from level 1 to level 2 $ 0 $ 0 $ 0 $ 0
Transfers from level 2 to level 1 0 0 0 0
Level 3        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 9,295 11,054 9,352 8,646
Included in earnings 24 22 3 71
Included in other comprehensive income (60) 45 (108) 117
Purchases 539 6,217 4,520 20,609
Sales (1,240) (318) (4,372) (978)
Transfers into Level 3 2,633 4,628 8,444 7,584
Transfers out of Level 3 (3,276) (6,338) (9,924) (20,739)
Ending balance 7,915 15,310 7,915 15,310
Level 3 | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 9,295 11,054 9,352 8,646
Included in earnings 24 22 3 71
Included in other comprehensive income (60) 45 (108) 117
Purchases 539 6,217 4,520 20,609
Sales (1,240) (318) (4,372) (978)
Transfers into Level 3 2,633 4,628 8,444 7,584
Transfers out of Level 3 (3,276) (6,338) (9,924) (20,739)
Ending balance 7,915 15,310 7,915 15,310
Level 3 | Fixed maturities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 9,295 11,054 9,352 8,646
Included in earnings 24 22 3 71
Included in other comprehensive income (60) 45 (108) 117
Purchases 539 6,217 4,520 20,609
Sales (1,240) (318) (4,372) (978)
Transfers into Level 3 2,633 4,628 8,444 7,584
Transfers out of Level 3 (3,276) (6,338) (9,924) (20,739)
Ending balance 7,915 15,310 7,915 15,310
Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 9,295 8,851 9,352 69
Included in earnings 24 22 3 67
Included in other comprehensive income (60) 38 (108) 119
Purchases 539 3,217 4,520 11,887
Sales (1,240) (318) (4,372) (924)
Transfers into Level 3 2,633 2,514 8,444 5,470
Transfers out of Level 3 (3,276) (4,135) (9,924) (6,499)
Ending balance $ 7,915 10,189 $ 7,915 10,189
Level 3 | Commercial mortgage-backed securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance   1,003   0
Included in earnings   0   0
Included in other comprehensive income   0   3
Purchases   0   1,000
Sales   0   0
Transfers into Level 3   0   0
Transfers out of Level 3   (1,003)   (1,003)
Ending balance   0   0
Level 3 | Collateralized debt obligations | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance   1,200   8,577
Included in earnings   0   4
Included in other comprehensive income   7   (5)
Purchases   3,000   7,722
Sales   0   (54)
Transfers into Level 3   2,114   2,114
Transfers out of Level 3   (1,200)   (13,237)
Ending balance   $ 5,121   $ 5,121