ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Schedule of Changes in AOCI By Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 15,473,158	$ 14,599,844	$ 14,063,566
OCI Before Reclassifications	(8,800)	(4,100)
Amounts Reclassified from AOCI	14,500	7,000
Other Comprehensive Income/(Loss), Net of Tax	5,700	2,900
Ending balance	14,173,892	15,473,158	14,599,844
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(39,421)	(42,275)	(76,411)
Ending balance	(33,737)	(39,421)	(42,275)
Qualified Cash Flow Hedging Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(400)	(400)
OCI Before Reclassifications	0	0
Amounts Reclassified from AOCI	0	0
Other Comprehensive Income/(Loss), Net of Tax	0	0
Ending balance	(400)	(400)	(400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,200)	400
OCI Before Reclassifications	0	(1,600)
Amounts Reclassified from AOCI	1,200	0
Other Comprehensive Income/(Loss), Net of Tax	1,200	(1,600)
Ending balance	0	(1,200)	400
Defined Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(37,800)	(42,300)
OCI Before Reclassifications	(8,800)	(2,500)
Amounts Reclassified from AOCI	13,300	7,000
Other Comprehensive Income/(Loss), Net of Tax	4,500	4,500
Ending balance	$ (33,300)	$ (37,800)	$ (42,300)