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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 13,630	$ 42,052	$ (86,415)	$ 143,538
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	5,229	16,343	14,945	43,053
Gross realized losses	(15,327)	(6,126)	(67,699)	(29,902)
Net realized (losses) gains on fixed maturity investments	(10,098)	10,217	(52,754)	13,151
Net unrealized (losses) gains on fixed maturity investments trading	(8,730)	5,545	(73,522)	48,940
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives	2,563	(4,020)	(763)	(4,344)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains on equity investments trading sold during the period	21,259	13,675	21,841	49,736
Net unrealized gains on equity investments trading still held at reporting date	8,636	16,635	18,783	36,055
Net realized and unrealized gains on equity investments trading	$ 29,895	$ 30,310	$ 40,624	$ 85,791

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