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Financial Instruments (Details 5) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Notional and fair values of the TBAs |  |
Notional, Sale of TBAs | $ 634,240 | $ 574,365
Notional, Purchase of TBAs | 131,857 | 137,572
Level 2 [Member] |  |
Notional and fair values of the TBAs |  |
Fair Value, Sale of TBAs | 5,846 | 5,791
Fair Value, Purchase of TBAs | $ 168 | $ 2,254

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