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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 170,645	$ (82,144)
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	24,373	4,583
Gross realized losses	(22,943)	(25,853)
Net realized gains (losses) on fixed maturity investments	1,430	(21,270)
Net unrealized gains (losses) on fixed maturity investments trading	103,922	(55,372)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives	13,796	(4,364)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized (losses) gains on equity investments trading sold during the period	(1,161)	234
Net unrealized gains (losses) on equity investments trading still held at reporting date	52,658	(1,372)
Net realized and unrealized gains (losses) on equity investments trading	$ 51,497	$ (1,138)

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