CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 191,095	$ 199,969	$ 569,037	$ 578,294
Other comprehensive income (loss), net of tax:
Change in unrealized investment gains and losses	44,689	128,455	124,883	110,604
Benefit plan adjustments	1,059	539	4,058	1,616
Other comprehensive income (loss), net of tax	45,748	128,994	128,941	112,220
Comprehensive income (loss)	$ 236,843	$ 328,963	$ 697,978	$ 690,514