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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative Instruments [Line Items] |  |
Notional Amount | $ 6,328,917 | $ 4,989,001
Carrying Value / Fair Value of Assets | 448,806 | 286,951
Carrying Value / Fair Value of Liabilities | 1,533,933 | 1,444,304
Designated As Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 703,118 | 677,828
Carrying Value / Fair Value of Assets | 1,280 | 419
Carrying Value / Fair Value of Liabilities | 23,715 | 24,956
Designated As Hedging [Member] | Interest Rate Swap Member |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 56,465 | 56,250
Carrying Value / Fair Value of Assets | 1,044 | 133
Carrying Value / Fair Value of Liabilities | 325 | 960
Designated As Hedging [Member] | Foreign Exchange Forward Member |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 646,653 | 621,578
Carrying Value / Fair Value of Assets | 236 | 286
Carrying Value / Fair Value of Liabilities | 23,390 | 23,996
Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 5,625,799 | 4,311,173
Carrying Value / Fair Value of Assets | 447,526 | 286,532
Carrying Value / Fair Value of Liabilities | 1,510,218 | 1,419,348
Designated As Non Hedging [Member] | Interest Rate Swap Member |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 2,875,588 | 2,748,317
Carrying Value / Fair Value of Assets | 344,157 | 184,842
Carrying Value / Fair Value of Liabilities | 188,142 | 18,702
Designated As Non Hedging [Member] | Future Member |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 245,481 | 277,814
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 0 | 0
Designated As Non Hedging [Member] | Foreign Exchange Forward Member |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 44,400 | 24,400
Carrying Value / Fair Value of Assets | 3,275 | 4,560
Carrying Value / Fair Value of Liabilities | 0 | 0
Designated As Non Hedging [Member] | Consumer Price Index Swap [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 101,455 | 101,069
Carrying Value / Fair Value of Assets | 388 | 766
Carrying Value / Fair Value of Liabilities | 0 | 0
Designated As Non Hedging [Member] | Credit Default Swap Member |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 644,500 | 649,500
Carrying Value / Fair Value of Assets | 990 | 1,313
Carrying Value / Fair Value of Liabilities | 7,812 | 10,949
Designated As Non Hedging [Member] | Equity Member |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 710,461 | 510,073
Carrying Value / Fair Value of Assets | 94,300 | 90,106
Carrying Value / Fair Value of Liabilities | 0 | 0
Designated As Non Hedging [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 375,337 | 361,456
Designated As Non Hedging [Member] | Embedded Derivatives In Indexed Annuity [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 4,416 | 4,945
Carrying Value / Fair Value of Liabilities | 733,655 | 751,523
Designated As Non Hedging [Member] | Embedded Derivatives In Variable Annuity [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 205,272 | 276,718
Designated As Non Hedging [Member] | Synthetic Guaranteed Investment Contracts [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 1,003,914 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | $ 0 | $ 0

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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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