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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI reclassifications (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOIC reclassifications |  |  |
Reclassification of foreign currency losses on assets held for sale | $ 6,036,000 |  |
Pension and Postretirement benefit plans |  |  |
AOIC reclassifications |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ (100,000.0) | $ (64,000.0) | $ 54,000.0

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