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Fair Value Measurements - Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Total Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 1,422 $ 4,951 $ 4,539 $ 4,959
Transfers out of Level 3     (3,100)  
Total realized gains (losses):        
Included in earnings and reported as losses incurred, net 0 0 0 0
Purchases 0 0 0 0
Sales (62) (106) (79) (114)
Balance at end of period 1,360 4,845 1,360 4,845
Debt Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 254 683 271 691
Transfers out of Level 3     0  
Total realized gains (losses):        
Included in earnings and reported as losses incurred, net 0 0 0 0
Purchases 0 0 0 0
Sales (62) (106) (79) (114)
Balance at end of period 192 577 192 577
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 1,168 4,268 4,268 4,268
Transfers out of Level 3     (3,100)  
Total realized gains (losses):        
Included in earnings and reported as losses incurred, net 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Balance at end of period 1,168 4,268 1,168 4,268
Real Estate Acquired        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 10,078 10,730 12,713 11,748
Transfers out of Level 3     0  
Total realized gains (losses):        
Included in earnings and reported as losses incurred, net (996) (63) (655) (226)
Purchases 10,869 9,421 16,763 18,104
Sales (6,630) (9,817) (15,500) (19,355)
Balance at end of period $ 13,321 $ 10,271 $ 13,321 $ 10,271