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OTHER COMPREHENSIVE INCOME (LOSS) (accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year $ (30,028) $ (37,264) $ (31,492)
Other comprehensive income (loss) before reclassifications 2,054 6,851 (11,107)
Amounts reclassified from accumulated other comprehensive loss (1,942) 385 5,335
Other comprehensive income (loss) 112 7,236 (5,772)
Accumulated other comprehensive loss (29,916) (30,028) (37,264)
Balance, end of year (29,916) (30,028) (37,264)
Postretirement benefit plans [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (19,824) (26,872) (15,431)
Other comprehensive income (loss) before reclassifications 3,188 6,263 (11,235)
Amounts reclassified from accumulated other comprehensive loss 70 785 (206)
Other comprehensive income (loss) 3,258 7,048 (11,441)
Accumulated other comprehensive loss (16,566) (19,824) (26,872)
Balance, end of year (16,566) (19,824) (26,872)
Net unrealized loss on debt securities [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year 0 (909) (344)
Other comprehensive income (loss) before reclassifications 0 (183) (571)
Amounts reclassified from accumulated other comprehensive loss 0 1,092 6
Other comprehensive income (loss) 0 909 (565)
Accumulated other comprehensive loss 0 0 (909)
Balance, end of year 0 0 (909)
Net unrealized loss on cash flow hedges [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (286) 2,593 (2,261)
Other comprehensive income (loss) before reclassifications 2,298 (524) 4,869
Amounts reclassified from accumulated other comprehensive loss (2,012) (2,355) (15)
Other comprehensive income (loss) 286 (2,879) 4,854
Accumulated other comprehensive loss 0 (286) 2,593
Balance, end of year 0 (286) 2,593
Foreign currency translation adjustment [Member]      
Accumulated other comprehensive loss [Line Items]      
Balance, beginning of year (9,918) (12,076) (13,456)
Other comprehensive income (loss) before reclassifications (3,432) 1,295 (4,170)
Amounts reclassified from accumulated other comprehensive loss 0 863 5,550
Other comprehensive income (loss) (3,432) 2,158 1,380
Accumulated other comprehensive loss (13,350) (9,918) (12,076)
Balance, end of year $ (13,350) $ (9,918) $ (12,076)