Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Assets Carried at Fair Value by Level) (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 26,300	$ 33,462	$ 35,296
Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	2,466	3,400
Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	22,711	28,772
Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	1,123	1,290
Fixed income bonds
Defined Benefit Plan Disclosure [Line Items]
Pension assets	22,180	28,392
Fixed income bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Fixed income bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	22,180	28,392
Fixed income bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension assets	2,466	3,400
Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	2,466	3,400
Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pooled separate accounts
Defined Benefit Plan Disclosure [Line Items]
Pension assets	531	380
Pooled separate accounts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pooled separate accounts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	531	380
Pooled separate accounts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account
Defined Benefit Plan Disclosure [Line Items]
Pension assets	1,123	1,290
Guaranteed deposit account | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 1,123	$ 1,290