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Fair Value Measurements (Schedule of Assets and Liabilities Measured at a Fair Value on Recurring Basis) (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities $ 823,000 $ 616,000
Interest rate swaps asset 136,000 8,871,000
Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 823,000 616,000
Deferred compensation liabilities 824,000 610,000
Interest rate swaps asset 136,000 8,871,000
Interest rate swaps liability 7,180,000 1,576,000
Recurring Basis [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 823,000 616,000
Deferred compensation liabilities 824,000 610,000
Recurring Basis [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps asset 136,000 8,871,000
Interest rate swaps liability $ 7,180,000 $ 1,576,000