Fair Value Measurements and Derivative Instruments Reporting (Fair Value And Basis Of Valuation Of Financial Liabilities) (Details) - Interest Rate Swap Asset [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	70	169
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities