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6. Interest Expense (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
Interest expense | $ 13,853 | $ 19,560 | $ 44,800 | $ 61,696
Securitization Trust Debt |  |  |  |
Interest expense | 8,357 | 9,398 | 25,725 | 28,557
Warehouse Lines of Credit |  |  |  |
Interest expense | 1,447 | 2,179 | 4,026 | 5,243
Senior Secured Debt, Related Party |  |  |  |
Interest expense | 1,599 | 3,077 | 6,474 | 9,873
Debt secured by receivables at fair value |  |  |  |
Interest expense | 623 | 3,275 | 3,435 | 13,362
Residual interest financing |  |  |  |
Interest expense | 1,079 | 731 | 2,666 | 2,125
Subordinated renewable notes |  |  |  |
Interest expense | $ 748 | $ 900 | $ 2,474 | $ 2,536

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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