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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Schedule of Changes in AOCI By Component (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | $ 14,599,844 | $ 14,063,566
OCI Before Reclassifications | (4,100) | 23,400
Amounts Reclassified from AOCI | 7,000 | 10,700
Net OCI | 2,900 | 34,100
Ending balance | 15,473,158 | 14,599,844
Total |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (42,275) | (76,411)
Ending balance | (39,421) | (42,275)
Qualified Cash Flow Hedging Instruments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (400) | (1,400)
OCI Before Reclassifications | 0 | 0
Amounts Reclassified from AOCI | 0 | 1,000
Net OCI | 0 | 1,000
Ending balance | (400) | (400)
Unrealized Gains/(Losses) on Marketable Securities |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 400 | 1,100
OCI Before Reclassifications | (1,600) | (700)
Amounts Reclassified from AOCI | 0 | 0
Net OCI | (1,600) | (700)
Ending balance | (1,200) | 400
Defined Benefit Plans |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (42,300) | (76,100)
OCI Before Reclassifications | (2,500) | 24,100
Amounts Reclassified from AOCI | 7,000 | 9,700
Net OCI | 4,500 | 33,800
Ending balance | $ (37,800) | $ (42,300)

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