ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Attributable to Parent [Roll Forward]
OCI Before Reclassifications					$ (900)	$ 100
Amounts Reclassified from AOCI					5,000	7,200
Other Comprehensive (Loss)/Income, Net of Tax	$ (1,047)	$ 5,203	$ 4,088	$ 3,230	4,156	7,318
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period		(33,700)		(39,400)	(33,700)	(39,400)
Other Comprehensive (Loss)/Income, Net of Tax	(1,047)	5,203	4,088	3,230
Balance as of End of Period	(29,600)		(32,100)		(29,600)	(32,100)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period		(400)		(400)	(400)	(400)
OCI Before Reclassifications					0	0
Amounts Reclassified from AOCI					0	0
Other Comprehensive (Loss)/Income, Net of Tax					0	0
Balance as of End of Period	(400)		(400)		(400)	(400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period				(1,200)		(1,200)
OCI Before Reclassifications						0
Amounts Reclassified from AOCI						1,200
Other Comprehensive (Loss)/Income, Net of Tax						1,200
Balance as of End of Period			0			0
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period		$ (33,300)		$ (37,800)	(33,300)	(37,800)
OCI Before Reclassifications					(900)	100
Amounts Reclassified from AOCI					5,000	6,000
Other Comprehensive (Loss)/Income, Net of Tax					4,100	6,100
Balance as of End of Period	$ (29,200)		$ (31,700)		$ (29,200)	$ (31,700)