Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension and Supplemental Executive Retirement Plans
Components of Net Periodic Benefit Cost [Abstract]
Company service cost	$ 0		$ 0	$ 0	$ 0
Interest cost	3,299		3,247	9,895	9,741
Expected return on plan assets	(3,443)		(3,644)	(10,327)	(10,932)
Net actuarial losses (gains)	547		522	1,639	1,568
Prior service cost (credit)	86		87	259	259
Cost of settlements and curtailments	1,284		0	4,964	0
Net periodic benefit cost (benefit)	1,773		212	6,430	636
Other Postretirement Benefit Plans
Components of Net Periodic Benefit Cost [Abstract]
Company service cost	234		417	703	1,251
Interest cost	311		376	933	1,126
Expected return on plan assets	(2,911)		(2,493)	(8,733)	(7,481)
Net actuarial losses (gains)	(692)		(382)	(2,077)	(1,142)
Prior service cost (credit)	118		454	353	1,360
Cost of settlements and curtailments	0		0	0	0
Net periodic benefit cost (benefit)	$ (2,940)		$ (1,628)	$ (8,821)	$ (4,886)
Pension Plan
Components of Net Periodic Benefit Cost [Abstract]
Company contribution to qualified pension plan		$ 7,500