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Finance Receivables, Allowance for Credit losses and Credit Quality Information (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Summary of finance receivables      
Finance receivables $ 430,431 $ 437,559 $ 317,500
Small installment loans [Member]
     
Summary of finance receivables      
Finance receivables 182,465 190,339 109,970
Large installment loans [Member]
     
Summary of finance receivables      
Finance receivables 51,895 57,428 57,594
Automobile purchase loans [Member]
     
Summary of finance receivables      
Finance receivables 165,812 159,837 135,848
Furniture and appliance purchase loans [Member]
     
Summary of finance receivables      
Finance receivables $ 30,259 $ 29,955 $ 14,088