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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other assets and (liabilities) $ 87,839   $ 87,839   $ 5,664
Debt 969,221   969,221   249,522
Debt, fair value 988,923   988,923   $ 279,000
Net unrealized gains (losses) recognized in earnings     (10,690) $ 2,908  
Other Investments | Net investment income          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net unrealized gains (losses) recognized in earnings (13,900) $ (6,000) (10,700) $ 2,900  
Other assets and (liabilities) | Other income (loss)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net unrealized gains (losses) recognized in earnings (100)   (400)    
Significant Unobservable Inputs (Level 3)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other assets and (liabilities) 76,949   76,949    
Assets, fair value (335,279)   (335,279)    
Significant Unobservable Inputs (Level 3) | Corporate | Discounted Cash Flow Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value (7,595)   $ (7,595)    
Significant Unobservable Inputs (Level 3) | Corporate | Weighted Average or Actual | Discounted Cash Flow Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Dividend rate     6.50%    
Liquidity discount     1.00%    
Risk-free rate     0.30%    
Credit spread     4.30%    
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value $ (226,000)   $ (226,000)    
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Minimum | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance (25.10%)        
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Maximum | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance 12.00%        
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Weighted Average or Actual | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance (5.30%)        
Significant Unobservable Inputs (Level 3) | Senior secured bank loan funds | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value $ (22,345)   (22,345)    
Significant Unobservable Inputs (Level 3) | Senior secured bank loan funds | Weighted Average or Actual | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance 0.10%        
Significant Unobservable Inputs (Level 3) | Hedge funds | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value $ (2,390)   (2,390)    
Significant Unobservable Inputs (Level 3) | Hedge funds | Minimum | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance 0.00%        
Significant Unobservable Inputs (Level 3) | Hedge funds | Maximum | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance 0.00%        
Significant Unobservable Inputs (Level 3) | Hedge funds | Weighted Average or Actual | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance 0.00%        
Significant Unobservable Inputs (Level 3) | Reinsurance deposit asset | Internal Valuation Model Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value $ (83,517)   $ (83,517)    
Significant Unobservable Inputs (Level 3) | Reinsurance deposit asset | Weighted Average or Actual | Internal Valuation Model Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated performance     3.00%    
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value (1,179)   $ (1,179)    
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Weighted Average or Actual | Internal Valuation Model Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidity discount     1.30%    
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contract | Internal Valuation Model Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liabilities, fair value (5,386)   $ (5,386)    
Significant Unobservable Inputs (Level 3) | Weather Contract | Internal Valuation Model Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liabilities, fair value $ (3)   $ (3)    
U.S. treasuries          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 0.90%   0.90%   1.00%
Agencies          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.30%   1.30%   1.20%
Municipal          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 2.30%   2.30%    
Non-U.S. government (Sovereign Debt)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.10%   1.10%   1.10%
Non-U.S. government-backed corporate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.00%   1.00%   1.10%
Corporate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 3.40%   3.40%   3.20%
Agency mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 2.40%   2.40%   2.30%
Weighted average life     5 years 7 months 6 days   5 years 7 months 6 days
Non-agency prime residential mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 3.40%   3.40%   3.40%
Weighted average life     4 years   4 years 1 month 6 days
AltA non-agency mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 4.50%   4.50%   4.30%
Weighted average life     5 years 1 month 6 days   5 years
Commercial mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 2.40%   2.40%   2.10%
Weighted average life     3 years 6 months   3 years 6 months
Asset-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.60%   1.60%   1.50%
Weighted average life     2 years 7 months 6 days   2 years 6 months
Restricted stock units (RSUs) | Significant Other Observable Inputs (Level 2)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other assets and (liabilities) $ (8,500)   $ (8,500)    
Private equity partnerships | Minimum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     7 years    
Private equity partnerships | Maximum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     10 years    
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value (226,000)   $ (226,000)    
Senior secured bank loan funds          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investment in closed end fund 22,300   $ 22,300    
Senior secured bank loan funds | Minimum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     4 years    
Senior secured bank loan funds | Maximum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Liquidation period for fund assets     5 years    
Hedge funds          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Hedge fund side pocket investments $ 2,400   $ 2,400