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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 37,869 | $ 34,967 | $ 21,575
Write-offs | 0 | 0 | (4,196)
Balance at end of period | 41,492 | 37,869 | 34,967
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 261 | 1,196 | 1,219
Additional allowances charged to expense | 41 | 82 | 144
Recovery of previously reserved accounts | (100) | (127) | (82)
Write-offs | (145) | (760) | (68)
Foreign currency adjustments | (2) | (130) | (17)
Balance at end of period | $ 55 | $ 261 | $ 1,196

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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