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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gain (Loss) on Investments [Line Items]                      
Net realized and unrealized gains on investments $ (42,817) $ (41,138) $ (26,712) $ 41,749 $ 30,475 $ (31,097) $ 27,128 $ 14,927 $ (68,918) $ 41,433 $ 35,076
Fixed maturity investments                      
Gain (Loss) on Investments [Line Items]                      
Gross realized gains                 50,488 45,568 72,492
Gross realized losses                 (53,630) (14,868) (50,206)
Net realized gains on fixed maturity investments                 (3,142) 30,700 22,286
Net unrealized gains (losses) on fixed maturity investments trading                 (64,908) 19,680 (87,827)
Investments-related derivatives                      
Gain (Loss) on Investments [Line Items]                      
Net realized and unrealized (losses) gains on investments-related derivatives                 5,443 (30,931) 31,058
Equity investments                      
Gain (Loss) on Investments [Line Items]                      
Net unrealized gains (losses) on fixed maturity investments trading                 (22,659) 11,076 42,909
Net realized gains on equity investments trading                 $ 16,348 $ 10,908 $ 26,650