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Investments (Schedule of Net Realized and Unrealized Gains on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains on investments	$ 224,208	$ 34,395	$ 561,891	$ 395,655
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Net realized gains on fixed maturity investments trading	55,665	30,101	219,001	52,826
Net unrealized gains on fixed maturity investments trading	16,316	17,226	193,649	243,139
Net realized and unrealized gains on fixed maturity investments trading	71,981	47,327	412,650	295,965
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains on investments-related derivatives	2,033	11,134	59,586	62,103
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments trading	16,624	(72)	1,999	30,666
Net unrealized gains (losses) on equity investments trading	107,332	(26,451)	109,291	7,852
Net realized and unrealized gains (losses) on equity investments trading	123,956	(26,523)	111,290	38,518
Catastrophe bonds | Other investments
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains on other investments	12,611	9,242	2,711	(4,870)
Other | Other investments
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains on other investments	$ 13,627	$ (6,785)	$ (24,346)	$ 3,939

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