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ACCRUED LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
ACCRUED LIABILITIES |
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Compensation and fringe benefits | ​ | $ | 14,104 | ​ | $ | 11,184
Warranty reserve | ​ |  | 1,963 | ​ |  | 1,571
Income taxes payable | ​ | ​ | 2,127 | ​ | ​ | 1,459
Right of use liabilities | ​ | ​ | 4,347 | ​ | ​ | 4,666
Other accrued expenses | ​ |  | 4,774 | ​ |  | 5,982
​ | ​ | $ | 27,315 | ​ | $ | 24,862

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