Fair Value Measurements (Schedule of Assets and Liabilities Measured at a Fair Value on Recurring Basis) (Details) - Recurring Basis [Member] - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments related to deferred compensation liabilities	$ 838,000	$ 955,000
Interest rate swaps assets	1,161,000
Deferred compensation liabilities	861,000	982,000
Interest rate swaps liability	1,128,000	8,232,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments related to deferred compensation liabilities	838,000	955,000
Deferred compensation liabilities	861,000	982,000
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps assets	1,161,000
Interest rate swaps liability	$ 1,128,000	$ 8,232,000