CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 600,314	$ 446,061	$ 298,569
Other comprehensive (loss) income, net of tax
Change in unrealized holding gains (losses) on available-for-sale securities	7,079	27,784	(58,692)
Pension and other postretirement plans	(41,270)	(33,770)	76,566
Total other comprehensive (loss) income, net of tax	(34,191)	(5,986)	17,874
Comprehensive income	$ 566,123	$ 440,075	$ 316,443