Fair Value Measurements and Derivative Instruments Reporting (Fair value and basis of valuation of financial liabilities) (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Liabilities	$ 0	$ 0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Liabilities	237	194
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Liabilities	$ 0	$ 0