CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (Loss)/Income	$ (434,721)	$ 1,412,394	$ 1,228,046
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	20	20	972
Changes in Unrealized Gains/(Losses) on Marketable Securities	1,252	(1,636)	(671)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	4,412	4,470	33,835
Other Comprehensive Income, Net of Tax	5,684	2,854	34,136
Comprehensive Income Attributable to Noncontrolling Interests	(7,519)	(7,519)	(7,519)
Comprehensive (Loss)/Income Attributable to Common Shareholders	$ (436,556)	$ 1,407,729	$ 1,254,663