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Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reserves for doubtful accounts receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 4,576 | $ 4,523 | $ 5,128
Charges to Costs and Expenses | 390 | 591 | 822
Write-Offs/Cash Payments | (969) | (1,660) | (531)
Foreign Currency Translation | 705 | 1,122 | (896)
Balance at End of Year | 4,702 | 4,576 | 4,523
Valuation allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 6,211 | 4,891 | 4,446
Charges to Costs and Expenses | 402 | 1,789 | 885
Write-Offs/Cash Payments | 0 | (679) | (816)
Foreign Currency Translation | (401) | 210 | 376
Balance at End of Year | $ 6,212 | $ 6,211 | $ 4,891

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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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