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Fair Value Measurements - Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Total Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 4,845 $ 7,996 $ 4,959 $ 4,083
Total realized/unrealized gains (losses):        
Included in other comprehensive income   (3,519)    
Included in earnings and reported as net realized investment gains   3,579   3,579
Included in earnings and reported as losses incurred, net 0 0 0 0
Purchases 0 1,167 0 4,258
Sales (197) (4,125) (311) (6,822)
Balance at end of period 4,648 5,098 4,648 5,098
Debt Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 577 1,056 691 1,228
Total realized/unrealized gains (losses):        
Included in other comprehensive income   0    
Included in earnings and reported as net realized investment gains   0   0
Included in earnings and reported as losses incurred, net 0 0 0 0
Purchases 0 0 0 0
Sales (197) (226) (311) (398)
Balance at end of period 380 830 380 830
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 4,268 6,940 4,268 2,855
Total realized/unrealized gains (losses):        
Included in other comprehensive income   (3,519)    
Included in earnings and reported as net realized investment gains   3,579   3,579
Included in earnings and reported as losses incurred, net 0 0 0 0
Purchases 0 1,167 0 4,258
Sales 0 (3,899) 0 (6,424)
Balance at end of period 4,268 4,268 4,268 4,268
Real Estate Acquired        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 10,271 9,642 11,748 12,149
Total realized/unrealized gains (losses):        
Included in other comprehensive income   0    
Included in earnings and reported as net realized investment gains   0   0
Included in earnings and reported as losses incurred, net (592) (501) (818) (143)
Purchases 8,881 8,938 26,985 27,953
Sales (6,832) (7,515) (26,187) (29,395)
Balance at end of period $ 11,728 $ 10,564 $ 11,728 $ 10,564