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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts Receivable Reserves |  |  |
Balance at beginning of period | $ 1,243 | $ 1,109 | $ 1,630
Charged to cost and expenses | 1,126 | 1,244 | 2,173
Write-offs, Exchange Rate Fluctuations and Other Items | (1,080) | (1,110) | (2,694)
Balance at end of period | 1,289 | 1,243 | 1,109
Valuation Allowance Of Deferred Tax Assets [Member] |  |  |
Balance at beginning of period | 8,962 | 11,986 | 11,125
Net additions charged to income (expense) | (138) | (1,922) | 874
Write-offs, Exchange Rate Fluctuations and Other Items | (238) | (1,102) | (13)
Balance at end of period | $ 8,586 | $ 8,962 | $ 11,986

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- Definition Valuation allowances and reserves net additions charged to income expense + References No definition available. + Details
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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 increase in valuation and qualifying accounts and reserves from charge to cost and expense. + 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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