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11. Fair Value measurements (Details-Finance receivables) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Finance Receivables Measured at Fair Value: |  |  |  |
Balance at beginning of period | $ 9,058 | $ 43,021 | $ 14,476 | $ 43,021
Payments on finance receivables at fair value | (3,766) | (11,461) | (7,873) | (27,980)
Charge-offs on finance receivables at fair value | (213) | (739) | (556) | (1,740)
Discount accretion | 592 | 98 | (353) | 984
Mark to fair value | 15 | (600) | (8) | (613)
Balance at end of period | 5,686 | 30,319 | 5,686 | 30,319
Balance at beginning of period | 8,576 | 40,387 | 13,117 | 57,107
Principal payments on debt at fair value | (3,515) | (14,614) | (8,554) | (32,544)
Premium accretion | 186 | 452 | 490 | 1,556
Mark to fair value | 145 | (603) | 339 | (497)
Balance at end of period | 5,392 | 25,622 | 5,392 | 25,622
Reduction for principal payments collected and payable | (878) | (3,715) | (878) | (3,715)
Adjusted balance at end of period | $ 4,514 | $ 21,907 | $ 4,514 | $ 21,907

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- Definition Fair value of financial and nonfinancial obligations. + 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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