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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES |
Schedule of contractual commitments | Future minimum payments required under these commitments are as follows at December 31, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​
2020 |  | $ | 13,629 | ​
2021 |  | ​ | 11,004 | ​
2022 |  | ​ | 4,064 | ​
2023 |  | ​ | 785 | ​
2024 | ​ | ​ | 258 | ​
Thereafter |  | ​ | 1,742 | ​
Total obligations under operating leases | ​ | $ | 31,482 | ​

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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