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Derivative Instruments and Hedging Activities Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2009
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Sep. 30, 2009
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Jun. 30, 2009
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Mar. 31, 2009
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Interest Expense on Interest Rate Swap and Swaption Agreements | $ (24,900,000) | $ (3,300,000) | |||||||||||||
| Termination of Interest Rate Swaps and Swaptions, Number of Positions | 32 | 3 | |||||||||||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (10,719,000) | 22,361,000 | 9,766,000 | 5,347,000 | 2,959,000 | 3,098,000 | 153,000 | 946,000 | 0 | 0 | 0 | 0 | (60,014,000) | 812,000 | 364,000 |
| Gain (Loss) on Interest Rate Swap and Swaption Agreements | 1,411,000 | (39,311,000) | (50,808,000) | 1,939,000 | 3,693,000 | (4,436,000) | (4,054,000) | (1,547,000) | 364,000 | 0 | 0 | 0 | (86,769,000) | (6,344,000) | 364,000 |
| Termination of Interest Rate Swaps and Swaptions, Notional Amount | 3,200,000,000 | 300,000,000 | |||||||||||||
| Termination of Interest Rate Swaps and Swaptions, Interest Spread Settlement | 6,000,000 | 1,300,000 | |||||||||||||
| Gain on Termination of Interest Rate Swaps and Swaptions | (16,970,000) | (4,446,000) | 0 | ||||||||||||
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Interest Rate Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Derivative Liability, Average Notional Amount | 3,667,493,000 | 377,400,000 | |||||||||||||
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Other Contract [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Derivative Liability, Average Notional Amount | 726,781,000 | 91,745,000 | |||||||||||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | 91,000 | 2,711,000 | 0 | ||||||||||||
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Interest Rate Swaps and Swaptions Associated with U.S. Treasuries and TBA Contracts [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Gain (Loss) on Interest Rate Swap and Swaption Agreements | 6,112,000 | (2,047,000) | 0 | ||||||||||||
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Interest Rate Swaps and Swaptions Associated with Repurchase Agreements [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Gain (Loss) on Interest Rate Swap and Swaption Agreements | (92,881,000) | (4,297,000) | 364,000 | ||||||||||||
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Credit Default Swap, Buying Protection [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (8,137,000) | (44,000) | 0 | ||||||||||||
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Credit Default Swap, Selling Protection [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | 11,409,000 | 0 | 0 | ||||||||||||
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Inverse Interest-Only Securities [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||
| Derivative Liability, Average Notional Amount | 0 | 0 | |||||||||||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 23,392,000 | $ 4,489,000 | $ 0 | ||||||||||||