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Finance Receivables Summary of Finance Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Receivables [Abstract]      
Principal Balances $ 1,707,051 $ 1,601,710 $ 1,566,492
Accrued Interest 15,366 16,414  
Loan Origination Costs 17,123 16,498  
Finance Receivables $ 1,739,540 $ 1,634,622