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Guarantees - Changes from credit recourses agreements (Details) - Financial Guarantee - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Guarantor Obligations [Line Items] |  |  |  |
Balance as of beginning of period | $ 52,011 | $ 57,425 | $ 56,230 | $ 58,820
Provision (reversal) for recourse liability | 1,267 | (9) | 956 | 2,991
Net charge-offs | (5,178) | 9 | (9,086) | (4,386)
Balance as of end of period | $ 48,100 | $ 57,425 | $ 48,100 | $ 57,425

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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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