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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