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ACCOUNTS AND OTHER RECEIVABLE, NET (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCOUNTS AND OTHER RECEIVABLE, NET |
Schedule of accounts and other receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Amounts billed, net | ​ | $ | 217,549 | ​ | $ | 213,560
Unbilled receivables | ​ | ​ | 19,678 | ​ |  | 21,618
Total receivables, net | ​ | $ | 237,227 | ​ | $ | 235,178
Schedule of expected credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Balance at beginning of period |  | $ | 7,602 | ​ | $ | 7,745
Additions | ​ |  | 135 | ​ |  | 368
Deductions - write-offs, net of recoveries | ​ |  | (687) | ​ |  | (511)
Foreign currency translation | ​ | ​ | (18) | ​ | ​ | —
Other | ​ | ​ | (1,248) | ​ | ​ | —
Balance at end of period | ​ | $ | 5,784 | ​ | $ | 7,602

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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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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