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Guarantees - Changes from credit recourses agreements (Details) - Financial Guarantee - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Guarantor Obligations [Line Items] |  |  |  |
Balance as of beginning of period | $ 48,100 | $ 57,425 | $ 56,230 | $ 58,820
Provision for recourse liability | 2,755 | 3,000 | 3,711 | 5,991
Net charge-offs | (5,394) | (2,678) | (14,480) | (7,064)
Balance as of end of period | $ 45,461 | $ 57,747 | $ 45,461 | $ 57,747

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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