SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI reclassifications
Reclassification of foreign currency, net income	$ 1,348	$ (500)
Projected Pension and Postretirement Benefit Obligations
AOCI reclassifications
Amounts reclassified from accumulated other comprehensive income, net of tax	$ 200	$ 900	$ (34)

Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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