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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ (20,017)	$ 22,653	$ (31,059)	$ 139,471
Policy acquisition costs and other insurance expenses	(310,639)	(365,424)	(987,817)	(1,064,645)
Interest credited	143,292	126,099	333,068	349,068
Other revenues	112,764	75,942	272,020	218,091
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	(25,258)	(8,961)	(58,883)	(28,125)
Not Designated as Hedging Instrument
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(20,553)	(5,255)	30,217	59,757
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(12,228)	641	(47,399)	12,318
Not Designated as Hedging Instrument | Financial Futures
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(6,544)	(8,890)	(7,312)	(28,107)
Not Designated as Hedging Instrument | Foreign Currency Forwards
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(58)	24	3	577
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(4,223)	220	(996)	211
Not Designated as Hedging Instrument | Credit Default Swaps
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	4,689	4,137	5,371	15,374
Not Designated as Hedging Instrument | Equity Options
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(9,793)	(8,295)	(15,207)	(34,757)
Not Designated as Hedging Instrument | Longevity Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	2,426	3,334	6,983	7,180
Not Designated as Hedging Instrument | Mortality Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	473	(132)	(326)	(921)
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(2,081)	23,044	20,335	106,854
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Interest credited	(25,347)	13,133	6,523	35,490
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ 32,133	$ (6,205)	$ 62,242	$ 16,518

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- Definition

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Policy Acquisition Costs And Other Insurance Expenses

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Amount of realized and unrealized gain (loss) on investment.

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