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Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Inputs, Level 1 [Member] |  |
Liabilities |  |
Derivatives | $ 0 | $ 0
Fair Value, Inputs, Level 2 [Member] |  |
Liabilities |  |
Derivatives | 189 | 342
Fair Value, Inputs, Level 3 [Member] |  |
Liabilities |  |
Derivatives | $ 0 | $ 0

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