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Derivative Instruments Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 373,962	$ 259,161
Derivative instruments	719,683		415,258
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	(363,272)	(359,066)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments	794,610		461,610
Derivative Liabilities	3,923,633		3,384,922
Call Option [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	344,654	241,520
Call Option [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments	719,683		415,258
Option on Securities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	28,098	16,751
Option on Securities [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments	71,203		43,105
Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	477	0
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments	3,724		3,247
Fixed Index Annuity Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	335,174	342,315
Fixed Index Annuity Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	3,848,902		3,337,556
2015 Notes Embedded Conversion Derivative [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	28,098	16,751
2015 Notes Embedded Conversion Derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	71,203		43,105
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	733	890
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 3,528		$ 4,261

X

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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