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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At A Fair Value On Recurring Basis) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities $ 539,000 $ 492,000
Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 539,000 492,000
Share-based compensation liabilities 529,000 487,000
Interest rate swaps liability 3,945,000 2,777,000
Fair Value, Inputs, Level 1 [Member] | Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 539,000 492,000
Share-based compensation liabilities 529,000 487,000
Fair Value, Inputs, Level 2 [Member] | Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps liability $ 3,945,000 $ 2,777,000
Fair Value, Inputs, Level 3 [Member] | Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities
Share-based compensation liabilities
Interest rate swaps liability