Pension and Other Postretirement Plans - Amounts Recognized in Consolidated Financial Statements and Accumulated Other Comprehensive Income (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Pension Plans
Amounts recognized in the Company's Consolidated Financial Statements:
Assets	$ 1,185,000	$ 0
Liabilities	0	(3,094,000)
Net amount recognized	1,185,000	(3,094,000)
Amounts recognized in accumulated other comprehensive income:
Net (gain) loss	3,642,000	6,826,000
Prior service cost	0	0
Net amount recognized	3,642,000	6,826,000
Chairman and President Non-Qualified Defined Benefit Plans
Amounts recognized in the Company's Consolidated Financial Statements:
Assets	0	0
Liabilities	(44,448,000)	(51,571,000)
Net amount recognized	(44,448,000)	(51,571,000)
Amounts recognized in accumulated other comprehensive income:
Net (gain) loss	13,925,000	26,476,000
Prior service cost	345,000	404,000
Net amount recognized	14,270,000	26,880,000
Defined Benefit Postretirement Healthcare Plans
Amounts recognized in the Company's Consolidated Financial Statements:
Assets	0	0
Liabilities	(6,160,000)	(6,469,000)
Net amount recognized	(6,160,000)	(6,469,000)
Amounts recognized in accumulated other comprehensive income:
Net (gain) loss	1,539,000	2,288,000
Prior service cost	0	0
Net amount recognized	$ 1,539,000	$ 2,288,000