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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 194,003	$ (17,901)	$ 364,648	$ (100,045)
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	28,512	5,133	52,885	9,716
Gross realized losses	(7,217)	(26,519)	(30,160)	(52,372)
Net realized gains (losses) on fixed maturity investments	21,295	(21,386)	22,725	(42,656)
Net unrealized gains (losses) on fixed maturity investments trading	121,991	(9,420)	225,913	(64,792)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives	37,173	1,038	50,969	(3,326)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains on equity investments trading sold during the period	31,899	348	30,738	582
Net unrealized (losses) gains on equity investments trading still held at reporting date	(18,355)	11,519	34,303	10,147
Net realized and unrealized gains on equity investments trading	$ 13,544	$ 11,867	$ 65,041	$ 10,729

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