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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, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities $ 576,000 $ 539,000
Deferred compensation liabilities 576,000 529,000
Interest rate swaps liability 8,970,000 3,945,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 576,000 539,000
Deferred compensation liabilities 576,000 529,000
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps liability $ 8,970,000 $ 3,945,000
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities
Deferred compensation liabilities
Interest rate swaps liability