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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)

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