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ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS (Tables) | 6 Months Ended
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Jun. 30, 2020
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, |
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
Balance, beginning of period | ​ | $ | 5,402 | ​ | $ | 5,579 | ​ | $ | 5,452 | ​ | $ | 5,592 | ​
Provision for credit losses | ​ |  | 445 | ​ |  | — | ​ |  | 607 | ​ |  | — | ​
Uncollectible receivables written-off | ​ |  | (107) | ​ |  | (82) | ​ |  | (285) | ​ |  | (97) | ​
Effect of foreign currency | ​ |  | 55 | ​ |  | (2) | ​ |  | 21 | ​ |  | — | ​
Balance, end of period | ​ | $ | 5,795 | ​ | $ | 5,495 | ​ | $ | 5,795 | ​ | $ | 5,495 | ​

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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=118936363&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=119407570&loc=SL82919249-210447 + Details
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