CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 50,656	$ 49,430	$ 171,498	$ 561,108
Postretirement benefits:
Amortization of prior service costs/actuarial gain	(20)	12	(59)	36
Income tax expense (benefit)	4	(2)	12	(8)
Total comprehensive income	$ 50,640	$ 49,440	$ 171,451	$ 561,136