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	$ 762,994	$ 712,949	$ 865,349
Other comprehensive income (loss), net of tax:
Change in unrealized investment gains and losses	9,070	141,548	(558,534)
Benefit plans adjustment	19,049	23,682	(42,674)
Other comprehensive income (loss), net of tax	28,119	165,230	(601,208)
Comprehensive income	$ 791,113	$ 878,179	$ 264,141