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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
The following table summarizes the fair value of the Company’s derivatives subject to fair value measurement on a recurring basis as of September 30, 2018 and December 31, 2017 (in thousands):
 
Fair Value Measurements Using
Instrument
Quoted Prices
in Active
Markets (Level 1)
 
Significant Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Commodity Derivatives:
 
 
 
 
 
September 30, 2018
$
—

 
$
—

 
$
—

December 31, 2017
$
—

 
$
443

 
$
—
Fair value of debt instruments
The following table summarizes the fair value, carrying value and face value of the 2021 Notes and 2021 PIK Notes as of September 30, 2018 and December 31, 2017 (in thousands):
 
September 30, 2018
 
December 31, 2017
 
Fair Value
Face Value
Carrying Value
 
Fair Value
Face Value
Carrying Value
2021 Notes
$
4,155

$
9,427

$
9,707

 
$
7,306

$
9,427

$
9,821

2021 PIK Notes
121,240

275,046

274,621

 
198,717

263,202

271,577

 
$
125,395

$
284,473

$
284,328

 
$
206,023

$
272,629

$
281,398