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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Ceded Credit Risk [Line Items]    
Reinsurance ceded receivables $ 779,118 $ 683,972
Reinsurance Recoverables, Percentage of Total 100.00% 100.00%
Other Reinsurers [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance ceded receivables $ 137,644 $ 118,679
Reinsurance Recoverables, Percentage of Total 17.70% 17.30%
AM Best, A+ Rating [Member] | Reinsurer A [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance ceded receivables $ 291,115 $ 240,894
Reinsurance Recoverables, Percentage of Total 37.40% 35.20%
AM Best, A+ Rating [Member] | Reinsurer B [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance ceded receivables $ 203,584 $ 183,881
Reinsurance Recoverables, Percentage of Total 26.10% 26.90%
AM Best, A+ Rating [Member] | Reinsurer C [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance ceded receivables $ 65,528 $ 68,832
Reinsurance Recoverables, Percentage of Total 8.40% 10.10%
AM Best, A++ Rating [Member] | Reinsurer D [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance ceded receivables $ 40,860 $ 36,202
Reinsurance Recoverables, Percentage of Total 5.20% 5.30%
AM Best, A Rating [Member] | Reinsurer E [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance ceded receivables $ 40,387 $ 35,484
Reinsurance Recoverables, Percentage of Total 5.20% 5.20%