Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension and Supplemental Executive Retirement Plans
Components of Net Periodic Benefit Cost [Abstract]
Company service cost	$ 0	$ 0
Interest cost	3,247	3,682
Expected return on plan assets	(3,644)	(3,581)
Net actuarial losses (gains)	523	597
Prior service cost (credit)	86	86
Cost of settlements and curtailments	0	7,847
Net periodic benefit cost (benefit)	212	8,631
Other Postretirement Benefit Plans
Components of Net Periodic Benefit Cost [Abstract]
Company service cost	417	386
Interest cost	375	398
Expected return on plan assets	(2,494)	(2,063)
Net actuarial losses (gains)	(380)	(64)
Prior service cost (credit)	453	465
Cost of settlements and curtailments	0	0
Net periodic benefit cost (benefit)	(1,629)	$ (878)
Pension Plan
Components of Net Periodic Benefit Cost [Abstract]
Company contribution to qualified pension plan	$ 23,000