INVENTORIES (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
INVENTORIES
Parts and raw materials	$ 74,623	$ 65,223
Work-in-process	9,750	9,529
Finished goods	12,792	14,981
Inventories	$ 97,165	$ 89,733

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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