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Reserve for Losses and Loss Adjustment Expenses (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
partition
Jun. 30, 2017
USD ($)
Dec. 31, 2017
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 200    
Summary of reserve for losses and loss adjustment expenses      
Balance, beginning of year $ 2,048,381 $ 1,993,428 $ 1,993,428
Less reinsurance recoverables on unpaid losses and loss adjustment expenses 335,585 273,475 273,475
Net balance, beginning of year 1,712,796 1,719,953 1,719,953
Net losses:      
Current year 337,116 292,489 603,518
Favorable development of reserves established in prior years, net (45,601) (57,788) (134,360)
Total 291,515 234,701 469,158
Paid related to:      
Current year (34,174) (33,115) (106,633)
Prior years (215,488) (210,006) (369,682)
Total paid (249,662) (243,121) (476,315)
Net balance, end of period 1,754,649 1,711,533 1,712,796
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses 324,168 280,332 335,585
Balance, end of period 2,078,817 $ 1,991,865 $ 2,048,381
Retroactive Insurance Contract      
Net losses:      
Current year 25,400    
Paid related to:      
Balance, end of period $ 600