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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
 12 Months Ended
Jul. 18, 2014
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of the period   $ 310,544 $ 369,338
Total unrealized gains (losses)      
Included in net investment income   (13,351) 15,224
Included in other income (loss)   (426)  
Total realized gains (losses)      
Included in other income (loss)   6,628 1,262
Total foreign exchange gains (losses)   (2,174) (3,300)
Purchases   105,442 33,990
Sales   (84,353)  
Settlements   (80,223) (81,326)
Net transfers out of Level 3     (24,644)
Balance at end of the period   242,087 310,544
Fixed maturity investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of the period   15,660 27,580
Total unrealized gains (losses)      
Included in net investment income   (542) 12,724
Included in other income (loss)   0  
Total realized gains (losses)      
Included in other income (loss)   0 0
Total foreign exchange gains (losses)   0 0
Purchases   0 0
Sales   0  
Settlements   (7,500) 0
Net transfers out of Level 3 $ (24,600)   (24,644)
Balance at end of the period   7,618 15,660
Other investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of the period   303,818 344,248
Total unrealized gains (losses)      
Included in net investment income   (12,992) 1,045
Included in other income (loss)   0  
Total realized gains (losses)      
Included in other income (loss)   0 0
Total foreign exchange gains (losses)   (2,181) (3,279)
Purchases   24,446 43,130
Sales   0  
Settlements   (72,723) (81,326)
Net transfers out of Level 3     0
Balance at end of the period   240,368 303,818
Other Assets and Liabilities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of the period   (8,934) (2,490)
Total unrealized gains (losses)      
Included in net investment income   183 1,455
Included in other income (loss)   (426)  
Total realized gains (losses)      
Included in other income (loss)   6,628 1,262
Total foreign exchange gains (losses)   7 (21)
Purchases   80,996 (9,140)
Sales   (84,353)  
Settlements   0 0
Net transfers out of Level 3     0
Balance at end of the period   (5,899) (8,934)
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   (13,351) 2,434
Net investment income | Fixed maturity investments      
Total realized gains (losses)      
Change in unrealized gains for the period included in earnings for assets held at the end of the period   (359) (66)
Net investment income | Other investments      
Total realized gains (losses)      
Change in unrealized gains for the period included in earnings for assets held at the end of the period   (12,992) 1,045
Net investment income | Other Assets and Liabilities      
Total realized gains (losses)      
Change in unrealized gains for the period included in earnings for assets held at the end of the period   0 $ 1,455
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   (426)  
Other income (loss) | Fixed maturity investments      
Total realized gains (losses)      
Change in unrealized gains for the period included in earnings for assets held at the end of the period   0  
Other income (loss) | Other investments      
Total realized gains (losses)      
Change in unrealized gains for the period included in earnings for assets held at the end of the period   0  
Other income (loss) | Other Assets and Liabilities      
Total realized gains (losses)      
Change in unrealized gains for the period included in earnings for assets held at the end of the period   $ (426)