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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gain (Loss) on Investments [Line Items]
Net realized and unrealized (losses) gains on investments	$ (26,712)	$ 27,128	$ 15,037	$ 42,055
Fixed maturity investments
Gain (Loss) on Investments [Line Items]
Gross realized gains	8,672	12,166	30,204	25,633
Gross realized losses	(21,552)	(2,587)	(26,423)	(8,151)
Net realized (losses) gains on fixed maturity investments	(12,880)	9,579	3,781	17,482
Net unrealized gains (losses) on investments trading	(48,104)	29,918	(22,132)	57,800
Derivatives
Gain (Loss) on Investments [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives	19,816	(6,884)	15,608	(17,783)
Equity investments
Gain (Loss) on Investments [Line Items]
Net unrealized gains (losses) on investments trading	5,624	(10,619)	1,467	(20,499)
Net realized gains on equity investments trading	$ 8,832	$ 5,134	$ 16,313	$ 5,055

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio.

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