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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis
The following tables summarize the valuation of those assets and (liabilities) as of the dates presented:
 
 
December 31, 2017
 
 
Fair Value
 
Fair Value Measurement Classification
Description
 
Measurement
 
Level 1
 
Level 2
 
Level 3
Liabilities:
 
 

 
 

 
 

 
 

Commodity derivative liabilities – current
 
$
(27,777
)
 
$
—

 
$
(27,777
)
 
$
—

Commodity derivative liabilities – noncurrent
 
(13,900
)
 
—

 
(13,900
)
 
—

 
 
December 31, 2016
 
 
Fair Value
 
Fair Value Measurement Classification
Description
 
Measurement
 
Level 1
 
Level 2
 
Level 3
Liabilities:
 
 

 
 

 
 

 
 

Commodity derivative liabilities – current
 
$
(12,932
)
 
$
—

 
$
(12,932
)
 
$
—

Commodity derivative liabilities – noncurrent
 
(14,437
)
 
—

 
(14,437
)
 
—