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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 31,938	$ 13,630	$ 396,586	$ (86,415)
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	34,710	5,229	87,595	14,945
Gross realized losses	(4,609)	(15,327)	(34,769)	(67,699)
Net realized gains (losses) on fixed maturity investments	30,101	(10,098)	52,826	(52,754)
Net unrealized gains (losses) on fixed maturity investments trading	17,226	(8,730)	243,139	(73,522)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives	11,134	2,563	62,103	(763)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized (losses) gains on equity investments trading sold during the period	(72)
Net realized (losses) gains on equity investments trading sold during the period		21,259	30,666	21,841
Net unrealized (losses) gains on equity investments trading still held at reporting date	(26,451)
Net unrealized (losses) gains on equity investments trading still held at reporting date		8,636	7,852	18,783
Net realized and unrealized (losses) gains on equity investments trading	$ (26,523)	$ 29,895	$ 38,518	$ 40,624

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