Pension Plan (Details) - Weighted average asset allocations by asset category	Dec. 31, 2021	Dec. 31, 2020
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]
Total pension plan assets	100.00%	100.00%
Equity And Index Funds [Member]
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]
Total pension plan assets	68.80%	68.20%
Fixed Income Funds [Member]
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]
Total pension plan assets	31.20%	31.80%