CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 28,704	$ 30,231	$ 120,842	$ 511,678
Postretirement benefits:
Amortization of prior service costs/actuarial gain	(20)	12	(39)	24
Income tax expense (benefit)	4	(3)	8	(6)
Total comprehensive income	$ 28,688	$ 30,240	$ 120,811	$ 511,696