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11. Fair Value measurements (Details-Finance receivables) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Finance Receivables Measured at Fair Value: |  |  |  |  |  |
Balance at beginning of period | $ 5,686 | $ 30,319 | $ 14,476 | $ 59,668 | $ 9,058 | $ 43,021
Payments on finance receivables at fair value | (3,057) | (8,848) | (10,930) | (36,828) |  |
Charge-offs on finance receivables at fair value | (184) | (535) | (740) | (2,275) |  |
Discount accretion | 722 | 263 | 353 | 1,247 |  |
Mark to fair value | 35 | 18 | 43 | (595) |  |
Balance at end of period | 3,202 | 21,217 | 3,202 | 21,217 | 9,058 | 43,021
Balance at beginning of period | 5,392 | 21,907 | 13,117 | 57,107 | 8,576 | 40,387
Principal payments on debt at fair value | (2,363) | (5,107) | (10,917) | (41,365) |  |
Premium accretion | 141 | 379 | 631 | 2,079 |  |
Mark to fair value | 0 | (291) | 339 | (933) |  |
Balance at end of period | 3,170 | 16,888 | 3,170 | 16,888 | 8,576 | 40,387
Reduction for principal payments collected and payable | (592) | (570) | (592) | (570) |  |
Adjusted balance at end of period | $ 2,578 | $ 16,318 | $ 2,578 | $ 16,318 |  |

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