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Variable Interest Entities (Details) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2013
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jan. 02, 2013
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Mar. 31, 2014
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Apr. 02, 2014
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Mar. 31, 2014
Mona Lisa Re Ltd
Renaissance Reinsurance
Mar. 31, 2014
Mona Lisa Re Ltd
DaVinciRe
Mar. 31, 2014
Mona Lisa Re Ltd
Variable Interest Entity, Not Primary Beneficiary
Dec. 31, 2013
Mona Lisa Re Ltd
Variable Interest Entity, Not Primary Beneficiary
Jan. 02, 2013
Non-Voting Preference Shares
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Mar. 31, 2014
Non-Voting Preference Shares
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jul. 02, 2013
Non-Voting Preference Shares
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]                            
Gross premiums written $ 705,260,000 $ 635,418,000     $ 53,500,000     $ 0 $ 0          
Ceded premiums earned 113,293,000 105,471,000           2,400,000 1,700,000          
Issuance of equity to third party investors                       61,000,000 172,400,000  
Investment in variable interest entity 0 0                   76,400,000 109,700,000  
Variable interest entity, ownership percentage       25.80% 55.60% 38.90%                
Increase (decrease) in funds held under insurance agreements         17,500,000 15,000,000                
Risk participation percentage         42.90% 33.60% 31.40%              
Proceeds from sale of partial interest in consolidated subsidiary                           25,000,000
Assets 8,163,705,000   8,179,131,000 474,239,000   493,347,000       206,131,000 209,615,000      
Liabilities 3,414,446,000   3,174,887,000 474,238,000   493,346,000       206,131,000 209,615,000      
Other liabilities $ 200,626,000   $ 397,596,000 $ 156,250,000   $ 30,118,000