Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income	$ 101,891	$ 230,377
Other Comprehensive Income (Loss):
Actuarially Determined Long-Term Liability Adjustments (Net of tax: ($111), $274)	(385)	901
Unrealized (Loss) Gain on Investments in Available-for-Sale Securities (Net of tax: $36, ($64))	(126)	212
Other Comprehensive Income (Loss)	259	(689)
Comprehensive Income (Loss)	$ 102,150	$ 229,688