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11. Fair Value measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Finance Receivables Measured at Fair Value: |  |  |  |
Balance at beginning of period | $ 43,021 | $ 126,923 | $ 59,668 | $ 160,253
Payments on finance receivables at fair value | (11,461) | (27,607) | (27,980) | (64,103)
Charge-offs on finance receivables at fair value | (739) | (1,547) | (1,740) | (4,050)
Discount accretion | 98 | 1,239 | 984 | 5,049
Mark to fair value | (600) | 3,358 | (613) | 5,217
Balance at end of period | 30,319 | 102,366 | 30,319 | 102,366
Balance at beginning of period | 40,387 | 133,017 | 57,107 | 166,828
Principal payments on debt at fair value | (14,614) | (34,091) | (32,544) | (73,289)
Premium accretion | 452 | 2,126 | 1,556 | 5,108
Mark to fair value | (603) | 3,610 | (497) | 6,015
Balance at end of period | 25,622 | 104,662 | 25,622 | 104,662
Reduction for principal payments collected and payable | (3,715) | (9,452) | (3,715) | (9,452)
Adjusted balance at end of period | $ 21,907 | $ 95,210 | $ 21,907 | $ 95,210

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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