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Fair Value Measurements (Schedule of Assets and Liabilities Measured at a Fair Value on Recurring Basis) (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | $ 823,000 | $ 616,000
Interest rate swaps asset | 136,000 | 8,871,000
Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | 823,000 | 616,000
Deferred compensation liabilities | 824,000 | 610,000
Interest rate swaps asset | 136,000 | 8,871,000
Interest rate swaps liability | 7,180,000 | 1,576,000
Recurring Basis [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | 823,000 | 616,000
Deferred compensation liabilities | 824,000 | 610,000
Recurring Basis [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps asset | 136,000 | 8,871,000
Interest rate swaps liability | $ 7,180,000 | $ 1,576,000

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