CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 174,097	$ 154,547
Other comprehensive income (loss), net of tax:
Change in unrealized investment gains and losses	(10,392)	80,659
Benefit plan adjustments	539	5,353
Other comprehensive income (loss), net of tax	(9,853)	86,012
Comprehensive income (loss)	$ 164,244	$ 240,559