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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gain (Loss) on Investments [Line Items]                      
Net realized and unrealized gains (losses) on investments $ (49,967) $ 59,870 $ 69,772 $ 61,653 $ (42,817) $ (41,138) $ (26,712) $ 41,749 $ 141,328 $ (68,918) $ 41,433
Fixed maturity investments                      
Gain (Loss) on Investments [Line Items]                      
Gross realized gains                 72,739 50,488 45,568
Gross realized losses                 (38,315) (53,630) (14,868)
Net realized gains (losses) on fixed maturity investments                 34,424 (3,142) 30,700
Net unrealized gains (losses) on fixed maturity investments trading                 26,954 (64,908) 19,680
Net realized gains on equity investments trading                 34,424 (3,142) 30,700
Investments-related derivatives                      
Gain (Loss) on Investments [Line Items]                      
Net realized and unrealized (losses) gains on investments-related derivatives                 (15,414) 5,443 (30,931)
Equity investments                      
Gain (Loss) on Investments [Line Items]                      
Net realized gains (losses) on fixed maturity investments                 14,190 16,348 10,908
Net unrealized gains (losses) on fixed maturity investments trading                 81,174 (22,659) 11,076
Net realized gains on equity investments trading                 $ 14,190 $ 16,348 $ 10,908