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ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS (Tables) | 6 Months Ended
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Jun. 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 June 30, | ​ | Six Months Ended June 30, |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Balance, beginning of period | ​ | $ | 4,997 | ​ | $ | 5,402 | ​ | $ | 5,067 | ​ | $ | 5,452 | ​
Provision for credit losses | ​ |  | 135 | ​ |  | 445 | ​ |  | 155 | ​ | ​ | 607 | ​
Uncollectible receivables written-off | ​ |  | (178) | ​ |  | (107) | ​ |  | (261) | ​ | ​ | (285) | ​
Effect of foreign currency | ​ | ​ | (2) | ​ | ​ | 55 | ​ | ​ | (9) | ​ | ​ | 21 | ​
Acquisition | ​ |  | 988 | ​ |  | — | ​ |  | 988 | ​ | ​ | — | ​
Balance, end of period | ​ | $ | 5,940 | ​ | $ | 5,795 | ​ | $ | 5,940 | ​ | $ | 5,795 | ​

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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=121611835&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=121599337&loc=SL82919249-210447 + Details
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