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15. Fair Value measurements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Finance Receivables Measured at Fair Value:    
Balance at beginning of period $ 59,668 $ 160,253
Payments on finance receivables at fair value (43,122) (104,682)
Charge-offs on finance receivables at fair value (2,896) (6,681)
Discount accretion 1,421 4,144
Mark to fair value (595) 6,634
Balance at end of period 14,476 59,668
Debt Secured by Finance Receivables Measured at Fair Value:    
Balance at beginning of period 57,107 166,828
Principal payments on debt at fair value (45,969) (121,413)
Premium accretion 2,726 4,579
Mark to fair value (747) 7,113
Balance at end of period 13,117 57,107
Reduction for principal payments collected and payable (1,654) (5,548)
Adjusted balance at end of period $ 11,463 $ 51,559