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INVENTORIES (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
INVENTORIES
Parts and raw materials	$ 44,753	$ 44,750
Work-in-process	5,318	6,186
Finished goods	11,358	12,042
Inventories	$ 61,429	$ 62,978

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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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