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Loss and Loss Expense Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Activity in the reserve for losses and loss expenses [Roll Forward]    
Reserves at the beginning of the quarter $ 324,767 $ 301,753
Provision for losses and loss expenses [Abstract]    
Claims occurring during the current quarter 48,487 39,861
Claims occurring during prior quarters 112 (1,238)
Total incurred 48,599 38,623
Loss and loss expense payments [Abstract]    
Claims occurring during the current quarter 9,508 7,087
Claims occurring during prior quarters 41,814 35,526
Total paid 51,322 42,613
Reserves at the end of the quarter 322,044 298,296
Reinsurance recoverable on unpaid losses at the end of the quarter 256,797 226,498
Reserves, gross of reinsurance recoverable, at the end of the quarter 578,841 $ 524,794
Savings developed in settlements of claims with comparative developments for previous calendar years $ 112