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OTHER COMPREHENSIVE (LOSS) INCOME (accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year $ (31,492) $ (41,433) $ (47,947)
Other comprehensive income (loss) before reclassifications (11,107) 8,587 5,114
Amounts reclassified from accumulated other comprehensive loss 5,335 1,354 1,400
Other comprehensive (loss) income (5,772) 9,941 6,514
Accumulated other comprehensive loss (37,264) (31,492) (41,433)
Balance, end of year (37,264) (31,492) (41,433)
Postretirement benefit plans [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (15,431) (21,956) (28,406)
Other comprehensive income (loss) before reclassifications (11,235) 6,194 5,616
Amounts reclassified from accumulated other comprehensive loss (206) 331 834
Other comprehensive (loss) income (11,441) 6,525 6,450
Accumulated other comprehensive loss (26,872) (15,431) (21,956)
Balance, end of year (26,872) (15,431) (21,956)
Net unrealized loss on debt securities [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (344) (90) (275)
Other comprehensive income (loss) before reclassifications (571) (254) 338
Amounts reclassified from accumulated other comprehensive loss 6 0 (153)
Other comprehensive (loss) income (565) (254) 185
Accumulated other comprehensive loss (909) (344) (90)
Balance, end of year (909) (344) (90)
Net unrealized loss on cash flow hedges [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (2,261) (5,351) (1,097)
Other comprehensive income (loss) before reclassifications 4,869 2,067 (4,973)
Amounts reclassified from accumulated other comprehensive loss (15) 1,023 719
Other comprehensive (loss) income 4,854 3,090 (4,254)
Accumulated other comprehensive loss 2,593 (2,261) (5,351)
Balance, end of year 2,593 (2,261) (5,351)
Foreign currency translation adjustment [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (13,456) (14,036) (18,169)
Other comprehensive income (loss) before reclassifications (4,170) 580 4,133
Amounts reclassified from accumulated other comprehensive loss 5,550 0 0
Other comprehensive (loss) income 1,380 580 4,133
Accumulated other comprehensive loss (12,076) (13,456) (14,036)
Balance, end of year $ (12,076) $ (13,456) $ (14,036)