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11. Fair Value measurements (Details-Finance receivables) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Finance Receivables Measured at Fair Value:    
Balance at beginning of period $ 14,476 $ 59,668
Payments on finance receivables at fair value (5,321) (16,519)
Charge-offs on finance receivables at fair value (343) (1,001)
Discount accretion 239 886
Mark to fair value 7 (13)
Balance at end of period 9,058 43,021
Balance at beginning of period 13,117 57,107
Principal payments on debt at fair value (5,039) (17,930)
Premium accretion 304 1,104
Mark to fair value 194 106
Balance at end of period 8,576 40,387
Reduction for principal payments collected and payable (1,399) (5,687)
Adjusted balance at end of period $ 7,177 $ 34,700