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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018 and 2017 was as follows: (in thousands):
 
 
As of December 31, 2018
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
 
     Commodity derivatives
 
$

 
$
186

 
$

 
$
186

          Total assets
 

 
186

 

 
186

Liabilities
 
 
 
 
 
 
 
 
     Commodity derivatives
 

 
(2
)
 

 
(2
)
Net liabilities
 
$

 
$
184

 
$

 
$
184


 
 
As of December 31, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Liabilities
 
 
 
 
 
 
 
 
     Commodity derivatives
 

 
(1,087
)
 

 
(1,087
)
Net liabilities
 
$

 
$
(1,087
)
 
$

 
$
(1,087
)