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Reinsurance (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Reinsurance (Textuals) [Abstract]    
Incurred but not reported recoverable $ 291,536 $ 214,863
Provision for uncollectible reinsurance relating to losses recoverable 5,025 4,997
Reinsurance Recoverable    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 470,635 $ 373,657
Percentage of total 100.00% 100.00%
Reinsurance Recoverable | A- or better    
Ceded Credit Risk [Line Items]    
Percentage of total 98.70% 98.70%
Reinsurance Recoverable | Top 10 reinsurers    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 391,076 $ 303,108
Percentage of total 83.10% 81.10%
Reinsurance Recoverable | Top 10 reinsurers | Fully collateralized reinsurers | NR    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 80,829  
Percentage of total 17.20%  
Reinsurance Recoverable | Top 10 reinsurers | Swiss Re | AA-    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 80,604 $ 83,048
Percentage of total 17.10% 22.20%
Reinsurance Recoverable | Top 10 reinsurers | Lloyds Syndicates | A plus    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 79,508 $ 66,356
Percentage of total 16.90% 17.80%
Reinsurance Recoverable | Top 10 reinsurers | Hannover Re | AA-    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 47,686 $ 43,765
Percentage of total 10.10% 11.70%
Reinsurance Recoverable | Top 10 reinsurers | Everest Re | A plus    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 42,506 $ 43,060
Percentage of total 9.00% 11.50%
Reinsurance Recoverable | Top 10 reinsurers | Munich Re | AA-    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 18,161 $ 18,707
Percentage of total 3.90% 5.00%
Reinsurance Recoverable | Top 10 reinsurers | Transatlantic Re | A plus    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 11,719 $ 11,923
Percentage of total 2.50% 3.20%
Reinsurance Recoverable | Top 10 reinsurers | Hamilton Re | A-    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 11,623 $ 10,898
Percentage of total 2.50% 2.90%
Reinsurance Recoverable | Top 10 reinsurers | National Indemnity Company | AA plus    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 9,565 $ 10,293
Percentage of total 2.00% 2.80%
Reinsurance Recoverable | Top 10 reinsurers | Toa Re | A plus    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 8,875 $ 6,330
Percentage of total 1.90% 1.70%
Reinsurance Recoverable | Top 10 reinsurers | XL Re | A plus    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable   $ 8,728
Percentage of total   2.30%
Reinsurance Recoverable | Other reinsurers' balances greater than $1 million    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 70,763 $ 61,222
Percentage of total 15.00% 16.40%
Reinsurance Recoverable | Other reinsurers' balances less than $1 million    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable $ 8,796 $ 9,327
Percentage of total 1.90% 2.50%