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Fair Value Measurements (Details Textual) (USD $)
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Fair Value Measurements (Textual) [Abstract]            
Fair value of investment in receivable portfolios $ 1,200,000,000   $ 1,000,000,000      
Increase or decrease of the fair value 20,000,000          
Carrying value of investment in receivable portfolios $ 811,620,000 $ 869,859,000 $ 716,454,000 $ 649,682,000 $ 657,783,000 $ 644,753,000
Fluctuation in discount rate 1.00%