Pension and Other Postretirement Benefits (Schedule of Total Expense for All Retirement Plans) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) plan	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	$ 4,147	$ 4,001	$ 3,685
401(k) plan
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	3,804	3,580	3,196
Multiemployer and other defined benefit and pension plans
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	$ 92	79	78
Number of plans | plan	1
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	$ 251	$ 342	$ 411