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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period $ 369,338 $ 430,372
Total unrealized gains (losses)    
Included in net investment income 18,650 13,291
Total realized gains (losses)    
Included in other income (loss)   (1,970)
Total foreign exchange gains (losses) (27) (781)
Purchases 15,001 10,785
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 424
Settlements (24,353) (19,699)
Reclassified from other assets to other investments   0
Balance at end of the period 378,609 431,574
Net investment income
    
Total realized gains (losses)    
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) 18,650 13,291
Fixed maturity investments
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 27,580 27,792
Total unrealized gains (losses)    
Included in net investment income 9,558 275
Total realized gains (losses)    
Included in other income (loss)   0
Total foreign exchange gains (losses) 0 0
Purchases 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0
Settlements 0 0
Reclassified from other assets to other investments   0
Balance at end of the period 37,138 28,067
Fixed maturity investments | Net investment income
    
Total realized gains (losses)    
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) 9,558 275
Other Investments
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 344,248 381,067
Total unrealized gains (losses)    
Included in net investment income 7,876 13,016
Total realized gains (losses)    
Included in other income (loss)   0
Total foreign exchange gains (losses) 6 (781)
Purchases 15,001 10,785
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 424
Settlements (24,353) (19,699)
Reclassified from other assets to other investments   (18,242)
Balance at end of the period 342,778 402,206
Other Investments | Net investment income
    
Total realized gains (losses)    
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) 7,876 13,016
Other Assets and Liabilities
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period (2,490) 21,513
Total unrealized gains (losses)    
Included in net investment income 1,216 0
Total realized gains (losses)    
Included in other income (loss)   (1,970)
Total foreign exchange gains (losses) (33) 0
Purchases 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0
Settlements 0 0
Reclassified from other assets to other investments   18,242
Balance at end of the period (1,307) 1,301
Other Assets and Liabilities | Net investment income
    
Total realized gains (losses)    
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) $ 1,216 $ 0