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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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	$ 199,969	$ 182,844	$ 578,294	$ 528,445
Other comprehensive income (loss), net of tax:
Change in unrealized investment gains and losses	128,455	(75,221)	110,604	(24,796)
Benefit plan adjustments	539	3,213	1,616	9,412
Other comprehensive income (loss), net of tax	128,994	(72,008)	112,220	(15,384)
Comprehensive income (loss)	$ 328,963	$ 110,836	$ 690,514	$ 513,061

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