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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
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 359,042 $ 381,396 $ 310,544 $ 369,338
Total unrealized (losses) gains        
Included in net investment income (17,671) (13,641) (13,087) 15,805
Included in other income (loss) (78) (1,956) (426) 264
Total realized gains (losses)        
Included in other income (loss) 1,827 225 4,655 225
Total foreign exchange gains (losses) 40 (2,054) (1,804) (2,307)
Purchases 4,355 5,785 97,195 31,177
Settlements (12,236) (14,205) (61,798) (58,952)
Net transfers out of Level 3   (24,644)   (24,644)
Balance at end of the period 335,279 330,906 335,279 330,906
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 (17,671) (8,047) (12,905) 3,015
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 (78) (1,956) (426) 264
Fixed maturity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 7,660 46,176 15,660 27,580
Total unrealized (losses) gains        
Included in net investment income (65) (5,596) (565) 13,000
Included in other income (loss) 0 0 0 0
Total realized gains (losses)        
Included in other income (loss) 0 0 0 0
Total foreign exchange gains (losses) 0 0 0 0
Purchases 0 0 0 0
Settlements 0 0 (7,500) 0
Net transfers out of Level 3   (24,644)   (24,644)
Balance at end of the period 7,595 15,936 7,595 15,936
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 (65) (2) (383) 210
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 275,695 334,149 303,818 344,248
Total unrealized (losses) gains        
Included in net investment income (17,610) (8,054) (12,702) 1,401
Included in other income (loss) 0 0 0 0
Total realized gains (losses)        
Included in other income (loss) 0 0 0 0
Total foreign exchange gains (losses) 33 (2,074) (1,811) (2,273)
Purchases 4,853 12,425 15,728 37,817
Settlements (12,236) (14,205) (54,298) (58,952)
Net transfers out of Level 3   0   0
Balance at end of the period 250,735 322,241 250,735 322,241
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 (17,610) (8,054) (12,702) 1,401
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 75,687 1,071 (8,934) (2,490)
Total unrealized (losses) gains        
Included in net investment income 4 9 180 1,404
Included in other income (loss) (78) (1,956) (426) 264
Total realized gains (losses)        
Included in other income (loss) 1,827 225 4,655 225
Total foreign exchange gains (losses) 7 20 7 (34)
Purchases (498) (6,640) 81,467 (6,640)
Settlements 0 0 0 0
Net transfers out of Level 3   0   0
Balance at end of the period 76,949 (7,271) 76,949 (7,271)
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 4 9 180 1,404
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 $ (78) $ (1,956) $ (426) $ 264