INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year	$ 5,490	$ 6,414	$ 3,159
Additions to prior year tax positions	0		3,354
Reductions to prior year tax positions		(833)
Expirations	0	(203)	(209)
Foreign currency translation	6	112	110
Unrecognized tax benefits, end of year	$ 5,496	$ 5,490	$ 6,414

Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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