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 |