Pension, Postretirement, and Other Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Pension charges		$ 49,100		$ 49,100
Benefit obligation, employer contributions		7,900
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation expense	$ 7,300	6,600	$ 6,200
Benefit obligation period increase (decrease)	74,600	(147,000)
Acquisition	64,947	0
Actuarial (gain)/loss	6,317	(46,995)
Benefit obligation, settlement		91,600
Profit sharing plan
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation expense	4,900	4,600	$ 4,800
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation period increase (decrease)	(7,000)	(9,200)
Acquisition	0	0
Actuarial (gain)/loss	$ (6,131)	$ (6,658)
Minimum | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of match	50.00%
Maximum | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of match	100.00%