Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets & Liabilities:
Non-current assets	$ 5,251	$ 5,123
Pension Benefits
Assets & Liabilities:
Non-current assets	5,251	5,123
Current liabilities	(4)	(3)
Non-current liabilities	(226)	(310)
Net assets (liabilities)	5,021	4,810
Accumulated Other Comprehensive Loss:
Net actuarial (loss) gain	(11,803)	(11,807)
Prior service benefit	0	0
Accumulated other comprehensive (loss) income	(11,803)	(11,807)
Other Postretirement Benefits
Assets & Liabilities:
Non-current assets	0	0
Current liabilities	(166)	(136)
Non-current liabilities	(1,275)	(1,308)
Net assets (liabilities)	(1,441)	(1,444)
Accumulated Other Comprehensive Loss:
Net actuarial (loss) gain	189	80
Prior service benefit	0	0
Accumulated other comprehensive (loss) income	$ 189	$ 80