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Derivative Financial Instruments (Details Textual)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2011
USD ($)
Jun. 30, 2012
Foreign currency forward contracts [Member]
JPY (¥)
ForwardContracts
Jun. 30, 2012
TBA Sale Agreements [Member]
USD ($)
Dec. 31, 2011
TBA Sale Agreements [Member]
USD ($)
Jun. 30, 2012
TBA Purchase Agreements [Member]
USD ($)
Jun. 30, 2012
TBA Purchase Contracts and Sale Agreements [Member]
USD ($)
Derivative (Textual) [Abstract]            
Derivative instruments number of contracts   80        
Derivative notional amount   ¥ 12,500 $ 13,250 $ 4,325 $ 9,245 $ 331,884
Unsettled TBA revenue $ 458