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Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 9,803 16,858 9,352 8,646
Included in earnings 29 30 (21) 49
Included in other comprehensive income (23) 57 (48) 72
Purchases 2,110 7,331 3,981 14,392
Sales (1,283) (551) (3,132) (660)
Transfers into Level 3 3,626 1,660 5,811 2,956
Transfer out of Level 3 (4,967) (14,331) (6,648) (14,401)
Ending balance 9,295 11,054 9,295 11,054
Level 3 | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 9,803 16,858 9,352 8,646
Included in earnings 29 30 (21) 49
Included in other comprehensive income (23) 57 (48) 72
Purchases 2,110 7,331 3,981 14,392
Sales (1,283) (551) (3,132) (660)
Transfers into Level 3 3,626 1,660 5,811 2,956
Transfer out of Level 3 (4,967) (14,331) (6,648) (14,401)
Ending balance 9,295 11,054 9,295 11,054
Level 3 | Fixed maturities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 9,803 16,858 9,352 8,646
Included in earnings 29 30 (21) 49
Included in other comprehensive income (23) 57 (48) 72
Purchases 2,110 7,331 3,981 14,392
Sales (1,283) (551) (3,132) (660)
Transfers into Level 3 3,626 1,660 5,811 2,956
Transfer out of Level 3 (4,967) (14,331) (6,648) (14,401)
Ending balance 9,295 11,054 9,295 11,054
Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 9,803 4,821 9,352 69
Included in earnings 29 30 (21) 45
Included in other comprehensive income (23) 54 (48) 81
Purchases 2,110 5,131 3,981 8,670
Sales (1,283) (551) (3,132) (606)
Transfers into Level 3 3,626 1,660 5,811 2,956
Transfer out of Level 3 (4,967) (2,294) (6,648) (2,364)
Ending balance $ 9,295 8,851 $ 9,295 8,851
Level 3 | Commercial mortgage-backed securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance   0   0
Included in earnings   0   0
Included in other comprehensive income   3   3
Purchases   1,000   1,000
Sales   0   0
Transfers into Level 3   0   0
Transfer out of Level 3   0   0
Ending balance   1,003   1,003
Level 3 | Collateralized debt obligations | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance   12,037   8,577
Included in earnings   0   4
Included in other comprehensive income   0   (12)
Purchases   1,200   4,722
Sales   0   (54)
Transfers into Level 3   0   0
Transfer out of Level 3   (12,037)   (12,037)
Ending balance   $ 1,200   $ 1,200