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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Gain (Loss) on Investments [Line Items]
Net realized and unrealized gains on investments	$ 58,113	$ 69,772	$ 101,486	$ 131,425
Fixed maturity investments
Gain (Loss) on Investments [Line Items]
Gross realized gains	15,249	22,661	26,710	40,411
Gross realized losses	(7,243)	(7,804)	(23,776)	(22,469)
Net realized gains	8,006	14,857	2,934	17,942
Net realized gains (losses) on investments trading	18,760	44,271	43,395	129,736
Derivatives
Gain (Loss) on Investments [Line Items]
Net realized and unrealized losses on investments-related derivatives	(268)	(9,151)	(324)	(28,600)
Equity investments
Gain (Loss) on Investments [Line Items]
Net realized gains	15,146	14,729	36,061	13,911
Net realized gains (losses) on investments trading	$ 16,469	$ 5,066	$ 19,420	$ (1,564)

X

- Definition

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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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