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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | $ 676,122 |  |
Unrecognized actuarial gain (loss), net of tax of $0.1, $0.1 and $0.6 million for the years December 31, 2020, 2019 and 2018 respectively | (2,412) | $ (445) | $ (840)
Foreign currency translation adjustment | 37 | (1,041) | (4,390)
Interest rate swap | (101) | (187) | 78
Reclassification of foreign currency losses on assets held for sale | 6,036 |  |
Ending Balance | 645,649 | 676,122 |
Adjust funded status of pension plan, tax | 100 | 100 | 600
Accumulated Other Comprehensive Income/(Loss) |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | (3,282) | (1,609) | 3,746
Unrecognized actuarial gain (loss), net of tax of $0.1, $0.1 and $0.6 million for the years December 31, 2020, 2019 and 2018 respectively | (2,412) | (445) | (840)
Foreign currency translation adjustment | 37 | (1,041) | (4,390)
Interest rate swap | (101) | (187) | 78
Reclassification of foreign currency losses on assets held for sale | 6,036 |  |
Ending Balance | 278 | (3,282) | (1,609)
Pension and Postretirement benefit plans |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | 1,842 | 2,287 | 3,127
Unrecognized actuarial gain (loss), net of tax of $0.1, $0.1 and $0.6 million for the years December 31, 2020, 2019 and 2018 respectively | (2,412) | (445) | (840)
Ending Balance | (570) | 1,842 | 2,287
Translation Adjustment |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | (5,076) | (4,035) | 355
Foreign currency translation adjustment | 37 | (1,041) | (4,390)
Ending Balance | (5,039) | (5,076) | (4,035)
Other |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | (48) | 139 | 264
Interest rate swap | (101) | (187) | 78
Reclassification of foreign currency losses on assets held for sale | 6,036 |  |
Ending Balance | $ 5,887 | $ (48) | 139
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income/(Loss) |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance |  |  | (203)
Cumulative Effect, Period of Adoption, Adjustment | Other |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance |  |  | $ (203)

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