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11. Fair Value measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Finance Receivables Measured at Fair Value: |  |  |  |
Balance at beginning of period | $ 30,319 | $ 102,366 | $ 59,668 | $ 160,253
Payments on finance receivables at fair value | (8,848) | (22,449) | (36,828) | (86,556)
Charge-offs on finance receivables at fair value | (535) | (1,259) | (2,275) | (5,309)
Discount accretion | 263 | 1,870 | 1,247 | 7,272
Mark to fair value | 18 | (3,044) | (595) | 1,824
Balance at end of period | 21,217 | 77,484 | 21,217 | 77,484
Debt Secured by Finance Receivables Measured at Fair Value: |  |  |  |
Balance at beginning of period | 21,907 | 104,662 | 57,107 | 166,828
Principal payments on debt at fair value | (5,107) | (26,902) | (41,365) | (97,703)
Premium accretion | 379 | 1,687 | 2,079 | 5,552
Mark to fair value | (291) | (2,817) | (933) | 1,953
Balance at end of period | 16,888 | 76,630 | 16,888 | 76,630
Reduction for principal payments collected and payable | (570) | (7,002) | (570) | (7,002)
Adjusted balance at end of period | $ 16,318 | $ 69,628 | $ 16,318 | $ 69,628

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