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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 ($) | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | $ 506,000 | $ 447,000
Deferred compensation liabilities | 506,000 | 435,000
Interest rate swaps asset | 3,614,000 | 3,074,000
Interest rate swaps liability | 1,392,000 | 2,321,000
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | 506,000 | 447,000
Deferred compensation liabilities | 506,000 | 435,000
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps asset | 3,614,000 | 3,074,000
Interest rate swaps liability | $ 1,392,000 | $ 2,321,000

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