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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, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | $ 654,000 | $ 552,000
Deferred compensation liabilities | 647,000 | 544,000
Interest rate swaps asset | 13,750,000 | 6,394,000
Interest rate swaps liability | 99,000 | 511,000
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments related to deferred compensation liabilities | 654,000 | 552,000
Deferred compensation liabilities | 647,000 | 544,000
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps asset | 13,750,000 | 6,394,000
Interest rate swaps liability | $ 99,000 | $ 511,000

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