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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2018
Investments, All Other Investments [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
As required by the standard, liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to their fair value measurement (in thousands):
 
March 31, 2018
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
 
$
-
 
 
$
189
 
 
$
-
 
 
December 31, 2017
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
 
 
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
 
$
-
 
 
$
342
 
 
$
-