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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance at beginning of the period   $ 2,776 $ 1,719   $ 1,719
Total realized and unrealized gains          
Purchases   (48)     (573)
Settlements   (7,500)     (7,500)
Balance at end of the period   (2,680) 2,776   (2,680)
Net investment income          
Total realized and unrealized gains          
Total realized and unrealized gains (losses)     (118)    
Other income (loss)          
Total realized and unrealized gains          
Total realized and unrealized gains (losses)   2,092 3,792    
Other assets and (liabilities)          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance at beginning of the period $ (12,135) (4,724) (5,899) $ (13,004) (5,899)
Total realized and unrealized gains          
Purchases 314 (48)   112 (573)
Settlements   0     0
Balance at end of the period (9,502) (2,680) (4,724) (9,502) (2,680)
Other assets and (liabilities) | Net investment income          
Total realized and unrealized gains          
Total realized and unrealized gains (losses)     0    
Other assets and (liabilities) | Other income (loss)          
Total realized and unrealized gains          
Total realized and unrealized gains (losses) $ 2,319 2,092 3,792 $ 3,390  
Fixed maturity investments          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance at beginning of the period   7,500 7,618   7,618
Total realized and unrealized gains          
Purchases   0     0
Settlements   (7,500)     (7,500)
Balance at end of the period   0 7,500   $ 0
Fixed maturity investments | Net investment income          
Total realized and unrealized gains          
Total realized and unrealized gains (losses)     (118)    
Fixed maturity investments | Other income (loss)          
Total realized and unrealized gains          
Total realized and unrealized gains (losses)   $ 0 $ 0