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REVENUE RECOGNITION AND RECEIVABLES (Tables) | 6 Months Ended
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Jun. 30, 2021
REVENUE RECOGNITION AND RECEIVABLES |
Summary of contracts asset and liabilities | Contract assets and liabilities consisted of the following (amounts in thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | June 30, 2021 | ​ | December 31, 2020 | ​ | ​ | $ Change | ​ | % Change
Contract asset – current | $ | 3,536 | ​ | $ | 2,478 | ​ | $ | 1,058 | ​ | 43 | %
Contract asset – noncurrent | ​ | 916 | ​ | ​ | 910 | ​ | ​ | 6 | ​ | 1 | %
Contract liability – current | ​ | (15,332) | ​ | ​ | (18,544) | ​ | ​ | 3,212 | ​ | 17 | %
Contract liability – noncurrent | ​ | (2,125) | ​ | ​ | (2,193) | ​ | ​ | 68 | ​ | 3 | %
Net contract liability | $ | (13,005) | ​ | $ | (17,349) | ​ | $ | 4,344 | ​ | 25 | %
Schedule of activity in allowances for credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six months ended June 30, 2021 | ​ | Six months ended June 30, 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period |  | $ | 12,121 | ​ | $ | 12,724
Current period provision for expected losses |  | ​ | 2,299 | ​ | ​ | 3,397
Write-offs charged against the allowance |  | ​ | (1,196) | ​ | ​ | (4,875)
Recoveries collected | ​ | ​ | 267 | ​ | ​ | 354
Balance at end of period | ​ | $ | 13,491 | ​ | $ | 11,600

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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=121599337&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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