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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of the valuation of the Company's financial assets and liabilities that were accounted for at fair value on a recurring basis
The following tables summarize the valuation of the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis in accordance with the classifications provided above as of June 30, 2018 and December 31, 2017 (in thousands). 
 
Fair Value Measurements at
June 30, 2018 using
Description
Level 1
 
Level 2
 
Level 3
 
Total
Assets (Liabilities)
 
 
 
 
 
 
 
Natural gas derivatives
$
—

 
$
79

 
$
—

 
$
79

Oil derivatives and basis swaps
—

 
(3,473
)
 
—

 
(3,473
)
Total
$
—

 
$
(3,394
)
 
$
—

 
$
(3,394
)
 
Fair Value Measurements at
December 31, 2017 using
Description
Level 1
 
Level 2
 
Level 3
 
Total
Assets (Liabilities)
 
 
 
 
 
 
 
Natural gas derivatives
$
—

 
$
1,190

 
$
—

 
$
1,190

Oil derivatives and basis swaps
—

 
(16,429
)
 
—

 
(16,429
)
           Total
$
—

 
$
(15,239
)
 
$
—

 
$
(15,239
)