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Fair Value Measurements and Derivative Instruments Reporting (Derivative instruments location and fair value amounts) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross recognized Liabilities | $ 101 | $ 129
Gross Amounts Offset | 0 | 0
Net Recognized Fair value Liabilities | 101 | 129
Interest Rate Swap - Current [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross recognized Liabilities | 47 | 55
Gross Amounts Offset | 0 | 0
Net Recognized Fair value Liabilities | 47 | 55
Interest Rate Swap - Non-Current [Member] | Taxes Payable and Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross recognized Liabilities | 54 | 74
Gross Amounts Offset | 0 | 0
Net Recognized Fair value Liabilities | $ 54 | $ 74

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