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Fair Value Disclosures (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Nonrecurring Measurements
Oil and gas properties are subject to impairment testing and potential impairment based largely on future estimated cash flows determined using Level 3 inputs.

 
Successor
 
 
Predecessor
 
December 31, 2018
 
 
December 31, 2017
(in thousands)
Original Carrying Value
 
Estimated Fair Value
 
Impairment
 
 
Original Carrying Value
 
Estimated Fair Value

Impairment
Unproved oil and gas properties
$
816,282

 
$
74,217

 
$
742,065

 
 
$
—

 
$
—

 
$
—

Proved oil and gas properties
1,895,670

 
604,023

 
1,291,647

 
 
3,350

 
2,162

 
1,188

Total
$
2,711,952

 
$
678,240

 
$
2,033,712

 
 
$
3,350

 
$
2,162

 
$
1,188