ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent [Roll Forward]
Amounts Reclassified from AOCI	$ 5,200	$ 3,200
Other Comprehensive Income, Net of Tax	5,203	3,230
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period	(33,700)	(39,400)
Other Comprehensive Income, Net of Tax	5,203	3,230
Balance as of End of Period	(28,500)	(36,200)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period	(400)	(400)
Amounts Reclassified from AOCI	0	0
Other Comprehensive Income, Net of Tax	0	0
Balance as of End of Period	(400)	(400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period		(1,200)
Amounts Reclassified from AOCI		1,200
Other Comprehensive Income, Net of Tax		1,200
Balance as of End of Period		0
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period	(33,300)	(37,800)
Amounts Reclassified from AOCI	5,200	2,000
Other Comprehensive Income, Net of Tax	5,200	2,000
Balance as of End of Period	$ (28,100)	$ (35,800)