Pension and Other Retirement Plans (Schedule of Fair Value and Allocation of Plan Assets) (Details) - Pension Plans [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	$ 149,727	$ 150,089	$ 205,089
Cash And Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	3,184	1,608
U.S. Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		3,666
International Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		2,856
Global Equity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	48,715
Domestic Corporate And Government Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	89,556	72,194
Domestic Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		69,243
International Corporate And Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		522
Global Corporate And Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	5,614
Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	2,658
Level I - Fair Value, Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	3,184	1,608
Level I - Fair Value, Inputs [Member] | Cash And Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	3,184	1,608
Level II - Fair Value, Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	146,543	148,481
Level II - Fair Value, Inputs [Member] | U.S. Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		3,666
Level II - Fair Value, Inputs [Member] | International Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		2,856
Level II - Fair Value, Inputs [Member] | Global Equity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	48,715
Level II - Fair Value, Inputs [Member] | Domestic Corporate And Government Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	89,556	72,194
Level II - Fair Value, Inputs [Member] | Domestic Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		69,243
Level II - Fair Value, Inputs [Member] | International Corporate And Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets		$ 522
Level II - Fair Value, Inputs [Member] | Global Corporate And Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	5,614
Level II - Fair Value, Inputs [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of plan assets	$ 2,658