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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2018
Investments, All Other Investments [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The following tables set forth the liabilities as of June 30, 2018 and December 31, 2017 that the Company measured at fair value, on a recurring basis by level, within the fair value hierarchy (in thousands). 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).
 
June 30, 2018
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
 
$
-
 
 
$
250
 
 
$
      -
 
 
December 31, 2017
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
 
 
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
 
$
-
 
 
$
342
 
 
$
      -