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Fair Value Measurements (Schedule of Assets and Liabilities Measured at a Fair Value on Recurring Basis) (Details) - Recurring Basis [Member] - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | $ 924,000 | $ 948,000
Deferred compensation liabilities | 937,000 | 952,000
Interest rate swaps liability | 13,208,000 | 18,927,000
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | 924,000 | 948,000
Deferred compensation liabilities | 937,000 | 952,000
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps liability | $ 13,208,000 | $ 18,927,000

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