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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | $ 580,813 |  |
Unrecognized actuarial gain, net of tax | 2,035 | $ 2,428 | $ 5,014
Pension settlement, net of tax | 195 | 915 |
Reclassification of foreign currency (gains) losses on assets, net of tax expense of $0, $0.2 million, and $0 | 1,348 | (500) |
Foreign currency translation adjustment | 229 | (1,385) | (689)
Interest rate swap | (1,749) | (21) | 170
Ending Balance | 541,073 | 580,813 |
Projected pension benefit obligation, tax expense (benefit) | 0 | (200) | (100)
Reclassification of loss on pension settlement, net of tax | (200) | (800) |
Reclassification of foreign currency losses, net of tax expense | 0 | 200 | 0
Unrealized gain on derivatives net of tax expense | 600 | 0 | 0
Other Comprehensive Income/(Loss) |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | 6,210 | 4,773 | 278
Unrecognized actuarial gain, net of tax | 2,035 | 2,428 | 5,014
Pension settlement, net of tax | 195 | 915 |
Reclassification of foreign currency (gains) losses on assets, net of tax expense of $0, $0.2 million, and $0 | 1,348 | (500) |
Foreign currency translation adjustment | 229 | (1,385) | (689)
Interest rate swap | (1,749) | (21) | 170
Ending Balance | 8,268 | 6,210 | 4,773
Projected Pension and Postretirement Benefit Obligations |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | 7,787 | 4,444 | (570)
Unrecognized actuarial gain, net of tax | 2,035 | 2,428 | 5,014
Pension settlement, net of tax | 195 | 915 |
Ending Balance | 10,017 | 7,787 | 4,444
Translation Adjustment |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance | (1,577) | 308 | 997
Reclassification of foreign currency (gains) losses on assets, net of tax expense of $0, $0.2 million, and $0 | 1,348 | (500) |
Foreign currency translation adjustment | 229 | (1,385) | (689)
Ending Balance |  | (1,577) | 308
Other |  |  |
Accumulated other comprehensive income (loss) |  |  |
Beginning Balance |  | 21 | (149)
Interest rate swap | (1,749) | $ (21) | 170
Ending Balance | $ (1,749) |  | $ 21

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