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OTHER COMPREHENSIVE INCOME (LOSS) (accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year $ (37,264) $ (31,492) $ (41,433)
Other comprehensive income (loss) before reclassifications 6,851 (11,107) 8,587
Amounts reclassified from accumulated other comprehensive loss 385 5,335 1,354
Other comprehensive income (loss) 7,236 (5,772) 9,941
Accumulated other comprehensive loss (30,028) (37,264) (31,492)
Balance, end of year (30,028) (37,264) (31,492)
Postretirement benefit plans [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (26,872) (15,431) (21,956)
Other comprehensive income (loss) before reclassifications 6,263 (11,235) 6,194
Amounts reclassified from accumulated other comprehensive loss 785 (206) 331
Other comprehensive income (loss) 7,048 (11,441) 6,525
Accumulated other comprehensive loss (19,824) (26,872) (15,431)
Balance, end of year (19,824) (26,872) (15,431)
Net unrealized loss on debt securities [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (909) (344) (90)
Other comprehensive income (loss) before reclassifications (183) (571) (254)
Amounts reclassified from accumulated other comprehensive loss 1,092 6 0
Other comprehensive income (loss) 909 (565) (254)
Accumulated other comprehensive loss 0 (909) (344)
Balance, end of year 0 (909) (344)
Net unrealized loss on cash flow hedges [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year 2,593 (2,261) (5,351)
Other comprehensive income (loss) before reclassifications (524) 4,869 2,067
Amounts reclassified from accumulated other comprehensive loss (2,355) (15) 1,023
Other comprehensive income (loss) (2,879) 4,854 3,090
Accumulated other comprehensive loss (286) 2,593 (2,261)
Balance, end of year (286) 2,593 (2,261)
Foreign currency translation adjustment [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (12,076) (13,456) (14,036)
Other comprehensive income (loss) before reclassifications 1,295 (4,170) 580
Amounts reclassified from accumulated other comprehensive loss 863 5,550 0
Other comprehensive income (loss) 2,158 1,380 580
Accumulated other comprehensive loss (9,918) (12,076) (13,456)
Balance, end of year $ (9,918) $ (12,076) $ (13,456)