ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Schedule of Changes in AOCI By Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 14,063,566	$ 12,629,994
OCI Before Reclassifications	23,400	(19,200)
Amounts Reclassified from AOCI	10,700	7,900
Net OCI	34,100	(11,300)
Ending balance	14,599,844	14,063,566
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(76,411)	(65,059)
Ending balance	(42,275)	(76,411)
Qualified Cash Flow Hedging Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,400)	(3,000)
OCI Before Reclassifications	0	0
Amounts Reclassified from AOCI	1,000	1,600
Net OCI	1,000	1,600
Ending balance	(400)	(1,400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1,100	700
OCI Before Reclassifications	(700)	400
Amounts Reclassified from AOCI	0	0
Net OCI	(700)	400
Ending balance	400	1,100
Defined Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(76,100)	(62,800)
OCI Before Reclassifications	24,100	(19,600)
Amounts Reclassified from AOCI	9,700	6,300
Net OCI	33,800	(13,300)
Ending balance	$ (42,300)	$ (76,100)