Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets & Liabilities:
Non-current assets	$ 5,123	$ 5,278
Pension Benefits
Assets & Liabilities:
Non-current assets	5,123	5,278
Current liabilities	(3)	(14)
Non-current liabilities	(310)	(257)
Net assets (liabilities)	4,810	5,007
Accumulated Other Comprehensive Loss:
Net actuarial (loss) gain	(11,807)	(11,171)
Prior service benefit	0	0
Accumulated other comprehensive (loss) income	(11,807)	(11,171)
Other Postretirement Benefits
Assets & Liabilities:
Non-current assets	0	0
Current liabilities	(136)	(148)
Non-current liabilities	(1,308)	(1,355)
Net assets (liabilities)	(1,444)	(1,503)
Accumulated Other Comprehensive Loss:
Net actuarial (loss) gain	80	119
Prior service benefit	0	97
Accumulated other comprehensive (loss) income	$ 80	$ 216