Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension and Supplemental Executive Retirement Plans
Components of Net Periodic Benefit Cost [Abstract]
Company service cost	$ 0		$ 0	$ 0	$ 0
Interest cost	3,297		3,247	6,596	6,494
Expected return on plan assets	(3,442)		(3,644)	(6,884)	(7,288)
Net actuarial losses (gains)	546		523	1,092	1,046
Prior service cost (credit)	87		86	173	172
Cost of settlements and curtailments	3,680		0	3,680	0
Net periodic benefit cost (benefit)	4,168		212	4,657	424
Other Postretirement Benefit Plans
Components of Net Periodic Benefit Cost [Abstract]
Company service cost	235		417	469	834
Interest cost	311		375	622	750
Expected return on plan assets	(2,911)		(2,494)	(5,822)	(4,988)
Net actuarial losses (gains)	(693)		(380)	(1,385)	(760)
Prior service cost (credit)	117		453	235	906
Cost of settlements and curtailments	0		0	0	0
Net periodic benefit cost (benefit)	$ (2,941)		$ (1,629)	$ (5,881)	$ (3,258)
Pension Plan
Components of Net Periodic Benefit Cost [Abstract]
Company contribution to qualified pension plan		$ 7,500