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Fair Value (Details 2)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Holdings
Sep. 30, 2015
USD ($)
Holdings
Sep. 30, 2016
USD ($)
Holdings
Sep. 30, 2015
USD ($)
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 4,600 100 7,600 100
Transfers from level 3 to level 2 $ 6,300 $ 0 $ 20,800 $ 100
Fixed maturities        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred from Level 2 to Level 3 | Holdings 11 1 27 1
No. of securities transferred from Level 3 to Level 2 | Holdings 18   40 1
Level 3        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance $ 11,054 $ 660 $ 8,646 $ 0
Included in earnings 22 0 71 0
Included in other comprehensive income 45 (61) 117 (61)
Purchases 6,217 4,546 20,609 5,316
Sales (318) 0 (978) 0
Transfers in and (out) of Level 3 (1,710) 124 (13,155) 14
Ending balance 15,310 5,269 15,310 5,269
Level 3 | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 11,054 660 8,646 0
Included in earnings 22 0 71 0
Included in other comprehensive income 45 (61) 117 (61)
Purchases 6,217 4,546 20,609 5,316
Sales (318) 0 (978) 0
Transfers in and (out) of Level 3 (1,710) 124 (13,155) 14
Ending balance 15,310 5,269 15,310 5,269
Level 3 | Fixed maturities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 11,054 660 8,646 0
Included in earnings 22 0 71 0
Included in other comprehensive income 45 (61) 117 (61)
Purchases 6,217 4,546 20,609 5,316
Sales (318) 0 (978) 0
Transfers in and (out) of Level 3 (1,710) 124 (13,155) 14
Ending balance 15,310 5,269 15,310 5,269
Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 8,851 0 69 0
Included in earnings 22 (1) 67 (1)
Included in other comprehensive income 38 (58) 119 (58)
Purchases 3,217 0 11,887 110
Sales (318) 0 (924) 0
Transfers in and (out) of Level 3 (1,621) 124 (1,029) 14
Ending balance 10,189 65 10,189 65
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 in and (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 1,200 660 8,577 0
Included in earnings 0 1 4 1
Included in other comprehensive income 7 (3) (5) (3)
Purchases 3,000 4,546 7,722 5,206
Sales 0 0 (54) 0
Transfers in and (out) of Level 3 914 0 (11,123) 0
Ending balance $ 5,121 $ 5,204 $ 5,121 $ 5,204