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Finance Receivables, Allowance for Credit losses and Credit Quality Information (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Summary of changes in allowance for credit losses    
Balance at beginning of year $ 23,616 $ 19,300
Provision for credit losses 8,071 5,627
Finance receivables charged off (7,356) (5,242)
Recoveries 299 175
Balance at end of year $ 24,630 $ 19,860