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Trade accounts receivable - net (Tables) | 12 Months Ended
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Dec. 31, 2021
Trade accounts receivable - net |
Schedule of Accounts, Notes, Loans and Financing Receivable | The following table represents the activity occurring in the reserves for doubtful accounts in 2021 and 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Beginning | ​ | Net additions | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance | ​ | charged to | ​ | Deductions | ​ | Ending Balance
(in thousands) |  | at January 1 |  | Operations |  | and Other |  | at December 31
2021 | ​ | $ | 1,597 | ​ | $ | 44 | ​ | $ | (57) | ​ | $ | 1,584
2020 | ​ | $ | 710 | ​ | $ | 880 | ​ | $ | 7 | ​ | $ | 1,597

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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