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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount	$ 11,127,801	$ 11,125,976
Carrying Value / Fair Value of Assets	227,358	260,898
Carrying Value / Fair Value of Liabilities	1,120,882	1,141,831
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	10,292,160	10,132,552
Carrying Value / Fair Value of Assets	139,055	188,817
Carrying Value / Fair Value of Liabilities	1,096,807	1,109,058
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	966,658	1,144,661
Carrying Value / Fair Value of Assets	71,399	93,783
Carrying Value / Fair Value of Liabilities	11,025	3,934
Not Designated as Hedging Instrument | Interest Rate Options
Derivative [Line Items]
Notional Amount	0	240,000
Carrying Value / Fair Value of Assets	0	18,195
Carrying Value / Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	313,905	275,983
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	60,000	67,967
Carrying Value / Fair Value of Assets	129	87
Carrying Value / Fair Value of Liabilities	7,551	15,098
Not Designated as Hedging Instrument | Consumer Price Index Swaps
Derivative [Line Items]
Notional Amount	39,537	41,938
Carrying Value / Fair Value of Assets	34	0
Carrying Value / Fair Value of Liabilities	57	561
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	891,700	805,700
Carrying Value / Fair Value of Assets	11,757	11,689
Carrying Value / Fair Value of Liabilities	3,937	3,502
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	483,830	555,361
Carrying Value / Fair Value of Assets	44,883	35,242
Carrying Value / Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument | Longevity Swap [Member]
Derivative [Line Items]
Notional Amount	891,760	450,000
Carrying Value / Fair Value of Assets	10,853	7,727
Carrying Value / Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument | Mortality Swap [Member]
Derivative [Line Items]
Notional Amount	50,000	50,000
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	1,754	797
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	22,094
Carrying Value / Fair Value of Liabilities	3,329	0
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	935,619	925,887
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	133,535	159,279
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	6,594,770	6,500,942
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	0	0
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	835,641	993,424
Carrying Value / Fair Value of Assets	88,303	72,081
Carrying Value / Fair Value of Liabilities	24,075	32,773
Designated As Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	120,000	120,000
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	23,662	18,228
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	715,641	676,972
Carrying Value / Fair Value of Assets	88,303	70,906
Carrying Value / Fair Value of Liabilities	413	0
Designated As Hedging Instrument | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	0	196,452
Carrying Value / Fair Value of Assets	0	1,175
Carrying Value / Fair Value of Liabilities	$ 0	$ 14,545

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-SubTopic 10



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