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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
The fair value hierarchy for our financial assets and liabilities accounted for at fair value on a recurring basis at December 31, 2017 and 2016 was as follows: (in thousands):

 
 
As of December 31, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Liabilities
 
 
 
 
 
 
 
 
     OTC commodity swaps
 
—

 
(1,087
)
 
—

 
(1,087
)
Net liabilities
 
$
—

 
$
(1,087
)
 
$
—

 
$
(1,087
)
 
 
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 assets
 
$
—

 
$
(73
)
 
$
—

 
$
(73
)