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Fair Value (Details 2)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Holdings
Jun. 30, 2015
USD ($)
Holdings
Jun. 30, 2016
USD ($)
Holdings
Jun. 30, 2015
USD ($)
Holdings
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
Transfers from level 2 to level 3 1,700 0 3,000 0
Transfers from level 3 to level 2 $ 14,300 $ 100 $ 14,400 $ 100
Fixed maturities        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred between Level 2 and Level 3 | Holdings 7   16  
No. of securities transferred between Level 3 and Level 2 | Holdings 21 1 22 1
Level 3        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance $ 16,858 $ 110 $ 8,646 $ 0
Included in earnings 30 0 49 0
Included in other comprehensive income 57 0 72 0
Purchases 7,331 660 14,392 770
Sales (551) 0 (660) 0
Transfers in and (out) of Level 3 (12,671) (110) (11,445) (110)
Ending balance 11,054 660 11,054 660
Level 3 | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 16,858 110 8,646 0
Included in earnings 30 0 49 0
Included in other comprehensive income 57 0 72 0
Purchases 7,331 660 14,392 770
Sales (551) 0 (660) 0
Transfers in and (out) of Level 3 (12,671) (110) (11,445) (110)
Ending balance 11,054 660 11,054 660
Level 3 | Fixed maturities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 16,858 110 8,646 0
Included in earnings 30 0 49 0
Included in other comprehensive income 57 0 72 0
Purchases 7,331 660 14,392 770
Sales (551) 0 (660) 0
Transfers in and (out) of Level 3 (12,671) (110) (11,445) (110)
Ending balance 11,054 660 11,054 660
Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 4,821 110 69 0
Included in earnings 30 0 45 0
Included in other comprehensive income 54 0 81 0
Purchases 5,131 0 8,670 110
Sales (551) 0 (606) 0
Transfers in and (out) of Level 3 (634) (110) 592 (110)
Ending balance 8,851 0 8,851 0
Level 3 | Commercial mortgage-backed securities | Available-for-sale securities        
Roll forward of consolidated 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 in and (out) of Level 3 0   0  
Ending balance 1,003   1,003  
Level 3 | Collateralized debt obligations | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 12,037 0 8,577 0
Included in earnings 0 0 4 0
Included in other comprehensive income 0 0 (12) 0
Purchases 1,200 660 4,722 660
Sales 0 0 (54) 0
Transfers in and (out) of Level 3 (12,037) 0 (12,037) 0
Ending balance $ 1,200 $ 660 $ 1,200 $ 660