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Derivative Instruments and Hedging Activities Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2013
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Dec. 31, 2012
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|---|---|---|
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Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | $ 544,515 | $ 462,080 |
| Derivative, Notional Amount | 27,657,236 | 9,768,656 |
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Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | (73,827) | (129,294) |
| Derivative, Notional Amount | 13,709,165 | 14,209,000 |
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Inverse Interest-Only Securities [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 226,744 | 304,975 |
| Derivative, Notional Amount | 1,648,236 | 1,909,351 |
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Inverse Interest-Only Securities [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 0 | 0 |
| Derivative, Notional Amount | 0 | 0 |
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Interest Rate Swap [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 51,374 | 0 |
| Derivative, Notional Amount | 17,575,000 | 0 |
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Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 0 | (129,055) |
| Derivative, Notional Amount | 0 | 14,070,000 |
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Credit Default Swap [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 0 | 52,906 |
| Derivative, Notional Amount | 0 | 438,440 |
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Credit Default Swap [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | (29,852) | 0 |
| Derivative, Notional Amount | 1,462,165 | 0 |
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Interest Rate Swaption [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 237,871 | 102,048 |
| Derivative, Notional Amount | 4,430,000 | 4,950,000 |
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Interest Rate Swaption [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 0 | 0 |
| Derivative, Notional Amount | 0 | 0 |
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Forward Contracts [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Notional Amount | 857,000 | 953,000 |
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Forward Contracts [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 21,896 | 1,917 |
| Derivative, Notional Amount | 1,504,000 | 2,414,000 |
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Forward Contracts [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | (34,634) | (239) |
| Derivative, Notional Amount | 4,247,000 | 139,000 |
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Options Held [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 6,630 | |
| Derivative, Notional Amount | 2,500,000 | |
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Options Held [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 0 | |
| Derivative, Notional Amount | 0 | |
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Swap [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | (9,341) | |
| Derivative, Notional Amount | 8,000,000 | |
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Swap [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 0 | |
| Derivative, Notional Amount | 0 | |
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Swap [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | (9,341) | |
| Derivative, Notional Amount | 8,000,000 | |
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Forward Purchase Commitment [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 234 | |
| Derivative, Notional Amount | 56,865 | |
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Forward Purchase Commitment [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | 0 | |
| Derivative, Notional Amount | $ 0 |