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ACCOUNTS AND OTHER RECEIVABLE, NET (Tables) | 12 Months Ended
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Dec. 31, 2020
ACCOUNTS AND OTHER RECEIVABLE, NET |
Schedule of accounts and other receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2020 |  | 2019
Amounts billed, net | ​ | $ | 213,560 | ​ | $ | 227,528
Unbilled receivables | ​ | ​ | 21,618 | ​ |  | 19,036
Total receivables, net | ​ | $ | 235,178 | ​ | $ | 246,564
Schedule of expected credit losses | ​
​ | ​ | ​ | ​
Balance as of December 31, 2019 |  | $ | 7,745
Additions | ​ |  | 368
Deductions - write-offs, net of recoveries | ​ |  | (511)
Balance as of December 31, 2020 | ​ | $ | 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=119407570&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=6877327&loc=d3e13212-122682 + Details
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