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Derivative Instruments Derivative Call Options, Notional Amount and Fair Value, by Counterparty (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Derivative [Line Items] |  |
Derivative, Collateral, Obligation to Return Cash | $ 572,200,000 | $ 328,700,000
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure | 78,400,000 | 93,700,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 629,135,000 | 415,258,000
Derivative, Notional Amount | 17,167,732,000 | 15,623,505,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Bank of America [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 39,162,000 | 16,533,000
Derivative, Notional Amount | 1,075,595,000 | 568,786,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Barclays [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 131,476,000 | 103,929,000
Derivative, Notional Amount | 3,617,125,000 | 3,463,777,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 68,448,000 | 60,301,000
Derivative, Notional Amount | 1,895,967,000 | 2,207,097,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Citibank, N.A. [Member] [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 64,812,000 | 67,592,000
Derivative, Notional Amount | 1,501,845,000 | 2,878,588,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 78,855,000 | 21,518,000
Derivative, Notional Amount | 2,922,641,000 | 936,625,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 42,587,000 | 20,787,000
Derivative, Notional Amount | 874,245,000 | 886,688,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, HSBC [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 14,010,000 | 6,539,000
Derivative, Notional Amount | 301,678,000 | 295,520,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 20,635,000 | 21,940,000
Derivative, Notional Amount | 643,078,000 | 735,016,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 70,329,000 | 40,113,000
Derivative, Notional Amount | 1,961,040,000 | 1,590,505,000
Not Designated as Hedging Instrument [Member] | Call Option [Member] | Derivative Counterparty, Wells Fargo (Wachovia) [Member] |  |
Derivative [Line Items] |  |
Derivative instruments | 98,821,000 | 56,006,000
Derivative, Notional Amount | $ 2,374,518,000 | $ 2,060,903,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -Subparagraph b -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 The amount of the obligation to return cash collateral under master netting arrangements that have not been offset against net derivative instrument positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 + Details
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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 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. 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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