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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other assets and (liabilities) $ 67,036   $ 67,036   $ (13,908)
Debt 972,362   972,362   249,522
Debt, fair value 984,776   984,776   279,000
Net unrealized gains (losses) recognized in earnings     3,238 $ 8,879  
Other Investments | Net investment income          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net unrealized gains (losses) recognized in earnings (1,600) $ 3,900 3,200 $ 8,900  
Other assets and liabilities | Other income (loss)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net unrealized gains (losses) recognized in earnings (300)   (300)    
Quoted Prices In Active Markets For Identical Assets (Level 1)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other assets and (liabilities) (23)   (23)   (569)
Significant Other Observable Inputs (Level 2)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other assets and (liabilities) (8,628)   (8,628)   (4,405)
Significant Unobservable Inputs (Level 3)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other assets and (liabilities) 75,687   75,687   $ (8,934)
Assets, fair value 359,042   359,042    
Significant Unobservable Inputs (Level 3) | Corporate | Discounted Cash Flow Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value 7,660   $ 7,660    
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     3.60%    
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 $ 250,796   $ 250,796    
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 3.10%        
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 (30.20%)        
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 14.00%        
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 $ 22,561   22,561    
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 1.20%        
Significant Unobservable Inputs (Level 3) | Hedge funds | Net Asset Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value $ 2,338   2,338    
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) | 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) | Reinsurance deposit asset | Internal Valuation Model Valuation Technique          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value $ 82,905   $ 82,905    
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]          
Liabilities, fair value (1,308)   $ (1,308)    
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 (5,896)   (5,896)    
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 $ (14)   $ (14)    
U.S. treasuries          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.00%   1.00%   1.00%
Agencies          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.70%   1.70%   1.20%
Municipal          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 2.40%   2.40%    
Non-U.S. government (Sovereign Debt)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.20%   1.20%   1.10%
Non-U.S. government-backed corporate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.10%   1.10%   1.10%
Corporate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 3.20%   3.20%   3.20%
Agency mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 2.20%   2.20%   2.30%
Weighted average life     6 years   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 1 month 6 days   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 4.10%   4.10%   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   3 years 6 months
Asset-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 1.40%   1.40%   1.50%
Weighted average life     2 years 4 months 24 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) $ (4,600)   $ (4,600)    
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 250,800   $ 250,800    
Senior secured bank loan funds          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investment in closed end fund 22,600   $ 22,600    
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 $ 2,300   $ 2,300