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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Measurements [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The fair value hierarchy for our financial assets accounted for at fair value on a recurring basis at June 30, 2017 and December 31, 2016 was as follows (in thousands):

 
 
As of June 30, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
 
OTC commodity swaps
 
$
—

 
$
11

 
$
—

 
$
11

     Total assets
 
—

 
11

 
—

 
11

Liabilities
 
 
 
 
 
 
 


OTC commodity swaps
 
—

 
(257
)
 
—

 
(257
)
Net liabilities
 
$
—

 
$
(246
)
 
$
—

 
$
(246
)
 
 
As of December 31, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
 
OTC commodity swaps
 
$
—

 
$
9

 
$
—

 
$
9

     Total assets
 
—

 
9

 
—

 
9

Liabilities
 
 
 
 
 
 
 
 
OTC commodity swaps
 
—

 
(82
)
 
—

 
(82
)
Net liabilities
 
$
—

 
$
(73
)
 
$
—

 
$
(73
)