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Fair Value Measurements (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Other Investments
Net investment income
Jun. 30, 2013
Other Investments
Net investment income
Jun. 30, 2014
Other Investments
Net investment income
Jun. 30, 2013
Other Investments
Net investment income
Mar. 31, 2010
5.75% Senior Notes Due March 15, 2020
RenRe North America Holdings Inc.
Jun. 30, 2014
5.75% Senior Notes Due March 15, 2020
RenRe North America Holdings Inc.
Dec. 31, 2013
5.75% Senior Notes Due March 15, 2020
RenRe North America Holdings Inc.
Mar. 17, 2010
5.75% Senior Notes Due March 15, 2020
RenRe North America Holdings Inc.
Jun. 30, 2014
Significant Other Observable Inputs (Level 2)
Dec. 31, 2013
Significant Other Observable Inputs (Level 2)
Jun. 30, 2014
Significant Other Observable Inputs (Level 2)
Cash Settled Restricted Stock Unit
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Dec. 31, 2013
Significant Unobservable Inputs (Level 3)
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Hedge funds
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Hedge funds
Minimum
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Hedge funds
Maximum
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Hedge funds
Weighted Average or Actual
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Senior secured bank loan funds
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Senior secured bank loan funds
Weighted Average or Actual
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Private equity partnerships
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Private equity partnerships
Minimum
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Private equity partnerships
Maximum
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Private equity partnerships
Weighted Average or Actual
Net Asset Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Corporate
Discounted Cash Flow Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Corporate
Internal Valuation Model Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Corporate
Weighted Average or Actual
Discounted Cash Flow Valuation Technique
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Private Equity Funds
Net Asset Valuation Technique
Jun. 30, 2014
Quoted Prices In Active Markets For Identical Assets (Level 1)
Dec. 31, 2013
Quoted Prices In Active Markets For Identical Assets (Level 1)
Jun. 30, 2014
U.S. treasuries
Dec. 31, 2013
U.S. treasuries
Jun. 30, 2014
Agencies
Dec. 31, 2013
Agencies
Jun. 30, 2014
Non-U.S. government (Sovereign Debt)
Dec. 31, 2013
Non-U.S. government (Sovereign Debt)
Jun. 30, 2014
Non-U.S. government-backed corporate
Dec. 31, 2013
Non-U.S. government-backed corporate
Jun. 30, 2014
Corporate
Dec. 31, 2013
Corporate
Jun. 30, 2014
Agency mortgage-backed
Dec. 31, 2013
Agency mortgage-backed
Jun. 30, 2014
Non-agency prime residential mortgage-backed
Dec. 31, 2013
Non-agency prime residential mortgage-backed
Jun. 30, 2014
AltA non-agency mortgage-backed
Dec. 31, 2013
AltA non-agency mortgage-backed
Jun. 30, 2014
Commercial mortgage-backed
Dec. 31, 2013
Commercial mortgage-backed
Jun. 30, 2014
Asset-backed
Dec. 31, 2013
Asset-backed
Jun. 30, 2014
Senior secured bank loan funds
Jun. 30, 2014
Private equity partnerships
Jun. 30, 2014
Hedge funds
Jul. 28, 2014
Common Shares
Trupanion
Subsequent Event
Jun. 30, 2014
Call Rights
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                                                                                                                  
Liabilities, fair value                             $ (1,071,000)                                                                                    
Weighted average effective yield                                                                 0.90% 0.80% 1.40% 1.30% 1.20% 1.30% 1.30% 1.10% 2.70% 2.70% 2.20% 2.90% 3.20% 3.70% 4.00% 4.70% 2.00% 2.10% 1.30% 2.00%          
Weighted average life                                                                                     5 years 2 months 12 days 6 years 2 months 12 days 4 years 3 months 18 days 4 years 4 months 24 days 4 years 6 months 0 days 4 years 3 years 10 months 24 days 3 years 3 months 18 days 2 years 4 months 24 days 3 years 6 months          
Other assets and (liabilities) 1,277,000   (8,233,000)                 546,000 (6,566,000) (5,200,000) 1,071,000 (2,490,000)                             (340,000) 823,000                                                  
Assets, fair value                             381,396,000   3,190,000       15,976,000   314,983,000       15,938,000 30,238,000   314,983,000                                                      
Investment Owned, Balance, Shares                                                                                                               2.5  
Investment Owned, at Fair Value                                                                                                               25,100,000  
Dividend rate                                                         6.20%                                                        
Liquidity discount                                                         1.00%                                                        
Risk-free rate                                                         0.30%                                                        
Credit spread                                                         1.10%                                                        
Estimated performance                                   0.00% 0.00% 0.00%   0.70%   (3.00%) 18.90% 4.00%                                                              
5.75% Senior notes issued                     250,000,000                                                                                            
Senior notes interest rate                 5.75%                                                                                                
Debt instrument maturity date               March 15, 2020                                                                                                  
Senior Notes, Fair value                 269,700,000 273,900,000                                                                                              
Net unrealized gains (losses) recognized in earnings 8,879,000 10,959,000   3,900,000 (5,300,000) 8,900,000 9,800,000                                                                                                    
Minimum estimated liquidation period                                                                                                         4 years 7 years      
Maximum estimated liquidation period                                                                                                         5 years 10 years      
Investment in closed end fund                                                                                                         16,000,000        
Hedge fund side pocket investments                                                                                                             3,200,000    
Derivative Asset $ 9,946,000   $ 10,667,000                                                                                                           $ 2,200,000