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Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 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 | $ 549,859 | $ 462,080 |
| Derivative, Notional Amount | 30,383,908 | 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 | (22,081) | (129,294) |
| Derivative, Notional Amount | 10,876,702 | 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 | 221,364 | 304,975 |
| Derivative, Notional Amount | 1,525,845 | 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 | 25,325 | 0 |
| Derivative, Notional Amount | 19,619,000 | 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 | (18,183) | 0 |
| Derivative, Notional Amount | 476,702 | 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 | 269,745 | 102,048 |
| Derivative, Notional Amount | 5,130,000 | 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 | 603,000 | 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 | 33,425 | 1,917 |
| Derivative, Notional Amount | 4,097,000 | 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 | (125) | (239) |
| Derivative, Notional Amount | 400,000 | 139,000 |
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Swap [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative, Fair Value, Net | (3,773) | |
| Derivative, Notional Amount | 10,000,000 | |
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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 | (3,773) | |
| Derivative, Notional Amount | 10,000,000 | |
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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 | 0 | 234 |
| Derivative, Notional Amount | 12,063 | 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 | 0 |
| Derivative, Notional Amount | $ 0 | $ 0 |