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ACCRUED LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2021
ACCRUED LIABILITIES |
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Compensation and fringe benefits | ​ | $ | 12,942 | ​ | $ | 11,184
Warranty reserve | ​ |  | 2,265 | ​ |  | 1,571
Income taxes payable | ​ | ​ | 1,862 | ​ | ​ | 1,459
Right of use liabilities | ​ | ​ | 4,347 | ​ | ​ | 4,666
Other accrued expenses | ​ |  | 4,526 | ​ |  | 5,982
​ | ​ | $ | 25,942 | ​ | $ | 24,862
Schedule of changes in the reserve for product warranty claims | Changes in the Company’s reserve for product warranty claims for the six months ended June 30, 2021 were as follows (in thousands): ​
​ | ​ | ​ | ​
​ | June 30, | ​
​ | 2021 |
Beginning balance | $ | 1,571 | ​
Provision |  | 809 | ​
Warranty expenditures |  | (108) | ​
Effect of foreign currency translation |  | (7) | ​
Ending balance | $ | 2,265 | ​

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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