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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, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities $ 701,000 $ 616,000
Deferred compensation liabilities 699,000 610,000
Interest rate swaps asset 4,688,000 8,871,000
Interest rate swaps liability 2,853,000 1,576,000
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 701,000 616,000
Deferred compensation liabilities 699,000 610,000
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps asset 4,688,000 8,871,000
Interest rate swaps liability $ 2,853,000 $ 1,576,000