ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent [Roll Forward]
OCI Before Reclassifications							$ (4,500)	$ (3,000)
Amounts Reclassified from AOCI							5,800	7,500
Net OCI	$ 1,858	$ (1,293)	$ 704	$ 2,477	$ 881	$ 1,188	1,269	4,546
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Beginning balance			(42,300)			(76,400)	(42,300)	(76,400)
Net OCI	1,858	$ (1,293)	704	2,477	$ 881	1,188
Ending balance	(41,000)			(71,900)			(41,000)	(71,900)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Beginning balance			(400)			(1,400)	(400)	(1,400)
OCI Before Reclassifications							0	0
Amounts Reclassified from AOCI							0	1,000
Net OCI							0	1,000
Ending balance	(400)			(400)			(400)	(400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Beginning balance			400			1,100	400	1,100
OCI Before Reclassifications							(2,000)	(600)
Amounts Reclassified from AOCI							0	0
Net OCI							(2,000)	(600)
Ending balance	(1,600)			500			(1,600)	500
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Beginning balance			$ (42,300)			$ (76,100)	(42,300)	(76,100)
OCI Before Reclassifications							(2,500)	(2,400)
Amounts Reclassified from AOCI							5,800	6,500
Net OCI							3,300	4,100
Ending balance	$ (39,000)			$ (72,000)			$ (39,000)	$ (72,000)