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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 ($)
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities $ 775,000 $ 823,000
Deferred compensation liabilities 781,000 824,000
Interest rate swaps asset   136,000
Interest rate swaps liability 22,652,000 7,180,000
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to deferred compensation liabilities 775,000 823,000
Deferred compensation liabilities 781,000 824,000
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps asset   136,000
Interest rate swaps liability $ 22,652,000 $ 7,180,000