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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (loss) on fixed maturity investments trading									$ 493,760	$ 260,443	$ (127,124)
Net realized and unrealized gains (losses) on equity investments trading									265,596	95,149	(39,161)
Net realized and unrealized gains (losses) on investments	$ 258,745	$ 224,208	$ 448,390	$ (110,707)	$ 18,454	$ 34,394	$ 191,248	$ 170,013	820,636	414,109	(183,168)
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on fixed maturity investments									276,901	90,260	(69,814)
Net unrealized gains (losses) on fixed maturity investments trading									216,859	170,183	(57,310)
Net realized and unrealized gains (losses) on investments									820,636
Investments-related derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives									68,608	58,891	(8,784)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains on equity investments trading sold during the period									3,532	31,062	27,739
Net unrealized gains (losses) on equity investments trading still held at reporting date									262,064	64,087	(66,900)
Other Investments | Catastrophe bonds
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains									(7,031)	(9,392)	(8,668)
Other Investments | Other
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains									$ (297)	$ 9,018	$ 569

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