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Reserve for Losses and Loss Adjustment Expenses - Narrative and Activity in the Reserve (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
partition
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
partition
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]          
Minimum period for claims resolution (years)     5 years    
Number of business partitions | partition 219   219    
Summary of reserve for losses and loss adjustment expenses          
Balance, beginning of year     $ 1,993,428 $ 2,005,326 $ 2,005,326
Less reinsurance recoverables on unpaid losses and loss adjustment expenses     273,475 249,350 249,350
Net balance, beginning of year     1,719,953 1,755,976 1,755,976
Net losses:          
Current year     292,489 283,329 587,007
Favorable loss development of reserves established in prior years, net $ (29,012) $ (36,769) (57,788) (65,475) (143,778)
Total     234,701 217,854 443,229
Paid related to:          
Current year     (33,115) (30,651) (96,190)
Prior years     (210,006) (204,193) (383,062)
Total paid     (243,121) (234,844) (479,252)
Net balance, end of year 1,711,533 1,738,986 1,711,533 1,738,986 1,719,953
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses 280,332 253,815 280,332 253,815 273,475
Balance, end of year $ 1,991,865 $ 1,992,801 $ 1,991,865 $ 1,992,801 $ 1,993,428