Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Obligations and Funded Status) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Change in plan assets:
Beginning balance	$ 35,296,000	$ 42,835,000
Actual return on plan assets	(222,000)	3,615,000
Employer contributions	0	0
Benefit payments	(1,612,000)	(1,647,000)
Transfer related to plan termination	0	(9,744,000)
Pension settlements	0	237,000
Ending balance	33,462,000	35,296,000	$ 42,835,000
Change in plan benefit obligations:
Fair value of plan benefit obligations as of January 1	30,289,000	30,300,000
Service cost	0	0	0
Interest cost	732,000	908,000	5,641,000
Actuarial (gain) loss	(757,000)	491,000
Benefit payments	(1,612,000)	(1,647,000)
Pension settlements	0	237,000
Fair value of plan benefit obligations as of December 31	28,652,000	30,289,000	30,300,000
Amount overfunded (underfunded)	4,810,000	5,007,000
Other Postretirement Benefits
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	165,000	192,000
Benefit payments	(165,000)	(192,000)
Transfer related to plan termination	0	0
Pension settlements	0	0
Ending balance	0	0	0
Change in plan benefit obligations:
Fair value of plan benefit obligations as of January 1	1,503,000	1,599,000
Service cost	41,000	56,000	61,000
Interest cost	26,000	40,000	59,000
Actuarial (gain) loss	39,000	0
Benefit payments	(165,000)	(192,000)
Pension settlements	0	0
Fair value of plan benefit obligations as of December 31	1,444,000	1,503,000	$ 1,599,000
Amount overfunded (underfunded)	$ (1,444,000)	$ (1,503,000)