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Finance Receivables Summary of Finance Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]    
Principal Balances $ 1,601,710 $ 1,466,680
Accrued Interest 16,414 12,971
Loan Origination Costs 16,498 15,689
Total Finance Receivables $ 1,634,622 $ 1,495,340