Finance Receivables, Credit Quality Information, and Allowance for Loan Losses (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of changes in allowance for loan losses        
Balance at beginning of period $ 19,860 $ 18,000 $ 19,300 $ 18,000
Provision for loan losses 5,908 3,489 11,535 7,325
CHARGE-OFFS (5,210) (3,612) (10,452) (7,616)
Recoveries 222 123 397 291
Balance at end of period $ 20,780 $ 18,000 $ 20,780 $ 18,000