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STOCKHOLDERS' EQUITY - AOCI Components (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Changes in accumulated other comprehensive income, net of tax, by component        
Balances $ 1,211,361 $ 1,063,212 $ 1,151,401 $ 929,067
OTHER COMPREHENSIVE INCOME (LOSS), net of tax (983) (996) (1,517) 279
Balances 1,220,733 1,126,292 1,220,733 1,126,292
Accumulated Other Comprehensive Income        
Changes in accumulated other comprehensive income, net of tax, by component        
Balances 6,569 4,974 7,103 3,699
Other comprehensive income (loss) before reclassifications     (776) 701
Amounts reclassified from accumulated other comprehensive income     (741) (422)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax (983) (996) (1,517) 279
Balances 5,586 3,978 5,586 3,978
Unrecognized Net Periodic Benefit Credit        
Changes in accumulated other comprehensive income, net of tax, by component        
Balances     6,896 4,160
Amounts reclassified from accumulated other comprehensive income     (741) (422)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     (741) (422)
Balances 6,155 3,738 6,155 3,738
Interest Rate Swap        
Changes in accumulated other comprehensive income, net of tax, by component        
Balances     2,604 309
Other comprehensive income (loss) before reclassifications     (781) 2,383
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     (781) 2,383
Balances 1,823 2,692 1,823 2,692
Foreign Currency Translation        
Changes in accumulated other comprehensive income, net of tax, by component        
Balances     (2,397) (770)
Other comprehensive income (loss) before reclassifications     5 (1,682)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     5 (1,682)
Balances $ (2,392) $ (2,452) $ (2,392) $ (2,452)