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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 ($)
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities $ 618,000 $ 552,000
Deferred compensation liabilities 619,000 544,000
Interest rate swaps asset 11,742,000 6,394,000
Interest rate swaps liability   511,000
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 618,000 552,000
Deferred compensation liabilities 619,000 544,000
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps asset $ 11,742,000 6,394,000
Interest rate swaps liability   $ 511,000