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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 378,609 $ 431,574 $ 369,338 $ 430,372
Total unrealized gains (losses)        
Included in net investment income 10,796 (2,259) 29,446 11,032
Included in other income (loss) 2,220 (676) 2,220 (2,646)
Total foreign exchange gains (losses) (226) 364 (253) (417)
Purchases 10,391 18,411 25,392 29,196
Sales   (424)    
Settlements (20,394) (27,828) (44,747) (47,527)
Reclassified from other assets to other investments       0
Balance at end of the period 381,396 420,010 381,396 420,010
Net investment income
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 10,796 (2,259) 29,446 11,032
Other loss
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 2,220   2,220  
Fixed maturity investments
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 37,138 28,067 27,580 27,792
Total unrealized gains (losses)        
Included in net investment income 9,038 114 18,596 389
Included in other income (loss) 0 0 0 0
Total foreign exchange gains (losses) 0 0 0 0
Purchases 0 0 0 0
Sales   0    
Settlements 0 (2,500) 0 (2,500)
Reclassified from other assets to other investments       0
Balance at end of the period 46,176 25,681 46,176 25,681
Fixed maturity investments | Net investment income
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 9,038 114 18,596 389
Fixed maturity investments | Other loss
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 0   0  
Other Investments
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 342,778 402,206 344,248 381,067
Total unrealized gains (losses)        
Included in net investment income 1,579 (2,373) 9,455 10,643
Included in other income (loss) 0 0 0 0
Total foreign exchange gains (losses) (205) 364 (199) (417)
Purchases 10,391 18,411 25,392 29,196
Sales   (424)    
Settlements (20,394) (25,328) (44,747) (45,027)
Reclassified from other assets to other investments       18,242
Balance at end of the period 334,149 393,704 334,149 393,704
Other Investments | Net investment income
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 1,579 (2,373) 9,455 10,643
Other Investments | Other loss
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 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 (1,307) 1,301 (2,490) 21,513
Total unrealized gains (losses)        
Included in net investment income 179 0 1,395 0
Included in other income (loss) 2,220 (676) 2,220 (2,646)
Total foreign exchange gains (losses) (21) 0 (54) 0
Purchases 0 0 0 0
Sales   0    
Settlements 0 0 0 0
Reclassified from other assets to other investments       (18,242)
Balance at end of the period 1,071 625 1,071 625
Other Assets and Liabilities | Net investment income
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period 179 0 1,395 0
Other Assets and Liabilities | Other loss
        
Total unrealized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period $ 2,220   $ 2,220