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Related Party Transactions and Major Customers (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
customer
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Related Party Transaction [Line Items]                      
Gross premiums written $ 336,093 $ 369,642 $ 661,997 $ 643,578 $ 132,780 $ 200,992 $ 511,540 $ 705,260 $ 2,011,310 $ 1,550,572 $ 1,605,412
Gross premiums earned                 1,769,088 1,450,047 1,482,511
Acquisition expenses 55,399 $ 78,126 $ 61,666 $ 43,401 39,749 $ 37,550 $ 33,477 $ 33,700 238,592 144,476 125,501
Net reinsurance costs and recoveries                 (96,734) (30,634) (13,852)
Reserve for claims and claim expenses 2,767,045       1,412,510       2,767,045 1,412,510 1,563,730
Distributions received                 $ 13,300 $ 10,300 $ 9,900
Gross premiums written                      
Related Party Transaction [Line Items]                      
Number of significant customers | customer                 3    
Percent of gross premiums received                 81.50% 87.20% 85.30%
Gross premiums written | AON                      
Related Party Transaction [Line Items]                      
Percent of gross premiums received                 48.10% 51.50% 45.30%
Gross premiums written | Marsh                      
Related Party Transaction [Line Items]                      
Percent of gross premiums received                 21.70% 21.50% 22.90%
Gross premiums written | Willis Towers Watson                      
Related Party Transaction [Line Items]                      
Percent of gross premiums received                 11.70% 14.20% 17.10%
Tower Hill Companies                      
Related Party Transaction [Line Items]                      
Gross premiums written                 $ 32,200 $ 40,000 $ 46,700
Gross premiums earned                 35,800 41,900 44,900
Acquisition expenses                 4,100 4,700 5,300
Related party receivables 14,300       18,300       14,300 18,300  
Net reinsurance costs and recoveries                 1,600 3,600 4,100
Reserve for claims and claim expenses $ 38,200       $ 40,300       38,200 40,300  
Distributions received                 $ 13,100 10,000  
Angus Partners LLC                      
Related Party Transaction [Line Items]                      
Ownership % 40.40%               40.40%    
Related party income                 $ 0 0 5,000
Top Layer Reinsurance Ltd.                      
Related Party Transaction [Line Items]                      
Distributions received                 0 0 0
Management fees revenue                 $ 2,600 $ 2,800 $ 3,800