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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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- Definition

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- Definition

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- Definition

Notional amount sale of to be announced securities.

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