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Fair Value Measurements (Details Textuals)
3 Months Ended
Mar. 31, 2013
Fair Value Measurements (Textuals) [Abstract]  
Weighted average constant prepayment rate 20.10%
Fair Value, Option, Quantitative Disclosures [Line Items]  
Weighted average discount rate 9.60%
MaximumMember
 
Fair Value, Option, Quantitative Disclosures [Line Items]  
3 month LIBOR forward range 3.07%
Weighted average discount rate 50.00%
MinimumMember
 
Fair Value, Option, Quantitative Disclosures [Line Items]  
3 month LIBOR forward range 0.35%
Weighted average discount rate 0.00%