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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