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ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS (Tables) | 9 Months Ended
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Sep. 30, 2021
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract] |
Schedule of Change in Allowance for Doubtful Accounts | Activity in the Company’s Allowance for credit losses consists of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30, |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Balance, beginning of period | ​ | $ | 5,940 | ​ | $ | 5,795 | ​ | $ | 5,067 | ​ | $ | 5,452 | ​
Provision for credit losses | ​ |  | (189) | ​ |  | 44 | ​ |  | (34) | ​ | ​ | 563 | ​
Uncollectible receivables written-off | ​ |  | 302 | ​ |  | (806) | ​ |  | 41 | ​ | ​ | (939) | ​
Effect of foreign currency | ​ | ​ | (7) | ​ | ​ | 24 | ​ | ​ | (16) | ​ | ​ | (19) | ​
Acquisition | ​ |  | — | ​ |  | — | ​ |  | 988 | ​ | ​ | — | ​
Balance, end of period | ​ | $ | 6,046 | ​ | $ | 5,057 | ​ | $ | 6,046 | ​ | $ | 5,057 | ​

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: 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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