Pension and Other Postretirement Plans - Plan Assets (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) investment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Defined Benefit Pension Plans
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 23,241,000	$ 20,833,000	$ 18,512,000
Plan assets	$ 1,185,000	$ 0
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	100.00%	100.00%	100.00%
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage pension assets not invested in cash or U.S. Government agencies (in percentage)	96.00%
Number of different investments | investment	247
Acceptable range for each asset class (in percentage)	4.90%
Defined Benefit Pension Plans | Level 1
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 16,767,000	$ 15,074,000
Defined Benefit Pension Plans | Level 2
Pension plan assets within the fair value hierachy
Fair value of plan assets	6,474,000	5,759,000
Defined Benefit Pension Plans | Level 3
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | Cash and cash equivalents
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 852,000	$ 1,050,000
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	4.00%	5.00%	4.00%
Defined Benefit Pension Plans | Cash and cash equivalents | Level 1
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 852,000	$ 1,050,000
Defined Benefit Pension Plans | Cash and cash equivalents | Level 2
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | Cash and cash equivalents | Level 3
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 0	$ 0
Defined Benefit Pension Plans | Equity securities
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	68.00%	67.00%	65.00%
Defined Benefit Pension Plans | Domestic
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 15,752,000	$ 13,853,000
Defined Benefit Pension Plans | Domestic | Level 1
Pension plan assets within the fair value hierachy
Fair value of plan assets	15,752,000	13,853,000
Defined Benefit Pension Plans | Domestic | Level 2
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | Domestic | Level 3
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | International
Pension plan assets within the fair value hierachy
Fair value of plan assets	163,000	170,000
Defined Benefit Pension Plans | International | Level 1
Pension plan assets within the fair value hierachy
Fair value of plan assets	163,000	170,000
Defined Benefit Pension Plans | International | Level 2
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | International | Level 3
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 0	$ 0
Defined Benefit Pension Plans | Debt securities:
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	28.00%	28.00%	31.00%
Defined Benefit Pension Plans | Corporate bonds
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 6,474,000	$ 5,759,000
Defined Benefit Pension Plans | Corporate bonds | Level 1
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | Corporate bonds | Level 2
Pension plan assets within the fair value hierachy
Fair value of plan assets	6,474,000	5,759,000
Defined Benefit Pension Plans | Corporate bonds | Level 3
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | Other invested assets
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	1,000
Defined Benefit Pension Plans | Other invested assets | Level 1
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	1,000
Defined Benefit Pension Plans | Other invested assets | Level 2
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Defined Benefit Pension Plans | Other invested assets | Level 3
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0
Chairman and President Non-Qualified Defined Benefit Plans
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0	$ 0
Plan assets	0	0
Defined Benefit Postretirement Healthcare Plans
Pension plan assets within the fair value hierachy
Fair value of plan assets	0	0	$ 0
Plan assets	$ 0	$ 0
Minimum | Cash and cash equivalents
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	0.00%
Minimum | Equity securities
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	55.00%
Minimum | Debt securities:
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	30.00%
Maximum | Cash and cash equivalents
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	15.00%
Maximum | Equity securities
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	70.00%
Maximum | Debt securities:
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	40.00%