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Investments (Schedule of Net Realized and Unrealized Losses on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gain (Loss) on Securities [Line Items]
Net realized and unrealized losses on investments	$ (345,563)	$ (110,707)
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Net realized gains on fixed maturity investments trading	20,398	57,487
Net unrealized losses on fixed maturity investments trading	(297,018)	(20,345)
Net realized and unrealized (losses) gains on fixed maturity investments trading	(276,620)	37,142
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains on investments-related derivatives	14,861	33,181
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments trading	109,887	(15,047)
Net unrealized losses on equity investments trading	(177,809)	(105,937)
Net realized and unrealized losses on equity investments trading	(67,922)	(120,984)
Catastrophe bonds | Other investments
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains on other investments	(19,083)	(14,352)
Other | Other investments
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains on other investments	$ 3,201	$ (45,694)

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