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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 381,396 $ 420,010 $ 369,338 $ 430,372
Total unrealized gains (losses)        
Included in net investment income (13,641) 20,169 15,805 31,201
Included in other (loss) income (1,956) (625) 264 (625)
Total realized gains (losses)        
Included in other (loss) income 225 281 225 (2,365)
Total foreign exchange gains (losses) (2,054) 1,218 (2,307) 801
Purchases 5,785 5,493 31,177 34,689
Settlements (14,205) (22,829) (58,952) (70,356)
Net transfers out of Level 3 (24,644)   (24,644)  
Reclassified from other assets to other investments       0
Balance at end of the period 330,906 423,717 330,906 423,717
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 (8,047) 20,169 3,015 29,991
Other income (loss)
        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period (1,956) (625) 264 (625)
Fixed maturity investments
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 46,176 25,681 27,580 27,792
Total unrealized gains (losses)        
Included in net investment income (5,596) (311) 13,000 78
Included in other (loss) income 0 0 0 0
Total realized gains (losses)        
Included in other (loss) income 0 0 0 0
Total foreign exchange gains (losses) 0 0 0 0
Purchases 0 0 0 0
Settlements 0 0 0 (2,500)
Net transfers out of Level 3 (24,644)   (24,644)  
Reclassified from other assets to other investments       0
Balance at end of the period 15,936 25,370 15,936 25,370
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 (2) (311) 210 78
Fixed maturity investments | Other income (loss)
        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 0 0 0 0
Other Investments
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 334,149 393,704 344,248 381,067
Total unrealized gains (losses)        
Included in net investment income (8,054) 20,480 1,401 31,123
Included in other (loss) income 0 0 0 0
Total realized gains (losses)        
Included in other (loss) income 0 0 0 0
Total foreign exchange gains (losses) (2,074) 1,218 (2,273) 801
Purchases 12,425 6,056 37,817 35,252
Settlements (14,205) (22,829) (58,952) (67,856)
Net transfers out of Level 3 0   0  
Reclassified from other assets to other investments       18,242
Balance at end of the period 322,241 398,629 322,241 398,629
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 (8,054) 20,480 1,401 29,913
Other Investments | Other income (loss)
        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 0 0 0 0
Other Assets and Liabilities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 1,071 625 (2,490) 21,513
Total unrealized gains (losses)        
Included in net investment income 9 0 1,404 0
Included in other (loss) income (1,956) (625) 264 (625)
Total realized gains (losses)        
Included in other (loss) income 225 281 225 (2,365)
Total foreign exchange gains (losses) 20 0 (34) 0
Purchases (6,640) (563) (6,640) (563)
Settlements 0 0 0 0
Net transfers out of Level 3 0   0  
Reclassified from other assets to other investments       (18,242)
Balance at end of the period (7,271) (282) (7,271) (282)
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 9 0 1,404 0
Other Assets and Liabilities | Other income (loss)
        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period $ (1,956) $ (625) $ 264 $ (625)