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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2019
Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS ​ ​ The following schedule provides the activity for accounts receivable reserves and valuation allowance for deferred tax assets for the years ended December 31, 2019, 2018 and 2017 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Charged to | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | beginning of | ​ | costs and | ​ | ​ | ​ | ​ | Balance at
​ |  | period |  | expenses |  | Write-offs |  | end of period
Accounts receivable reserves: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2019 | ​ | $ | 1,243 | ​ | $ | 1,126 | ​ | $ | (1,080) | ​ | $ | 1,289
Year ended December 31, 2018 | ​ | ​ | 1,109 | ​ | ​ | 1,244 | ​ | ​ | (1,110) | ​ | ​ | 1,243
Year ended December 31, 2017 | ​ | ​ | 1,630 | ​ | ​ | 2,173 | ​ | ​ | (2,694) | ​ | ​ | 1,109
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Net additions | ​ | Exchange rate | ​ | ​ | ​
​ | ​ | Balance at | ​ | charged to | ​ | fluctuations | ​ | ​ | ​
​ | ​ | beginning of | ​ | expense | ​ | and other | ​ | Balance at
​ |  | period |  | (benefit) |  | items |  | end of period
Valuation allowance for deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2019 | ​ | $ | 8,962 | ​ | $ | (138) | ​ | $ | (238) | ​ | $ | 8,586
Year ended December 31, 2018 | ​ | ​ | 11,986 | ​ | ​ | (1,922) | ​ | ​ | (1,102) | ​ | ​ | 8,962
Year ended December 31, 2017 | ​ | ​ | 11,125 | ​ | ​ | 874 | ​ | ​ | (13) | ​ | ​ | 11,986
​

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: 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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- References No definition available. + Details
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