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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, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities $ 482,000 $ 447,000
Deferred compensation liabilities 476,000 435,000
Interest rate swaps asset 2,689,000 3,074,000
Interest rate swaps liability 1,708,000 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 482,000 447,000
Deferred compensation liabilities 476,000 435,000
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps asset 2,689,000 3,074,000
Interest rate swaps liability $ 1,708,000 $ 2,321,000