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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Nonrecurring measurements
Oil, gas, and midstream properties, as well as our goodwill and intangible assets in our Midstream segment 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 (1)
 
Estimated Fair Value
 
Impairment
 
 
Original Carrying Value (1)
 
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

Equity method investment
17,063

 
1,100

 
15,963

 
 
—

 
—

 
—

Midstream property, plant and equipment
474,529

 
406,122

 
68,407

 
 
—

 
—

 
—

Intangible assets
394,999

 
—

 
394,999

 
 
—

 
—

 
—

Goodwill
691,970

 
—

 
691,970

 
 
—

 
—

 
—

Total
$
4,290,513

 
$
1,085,462

 
$
3,205,051

 
 
$
3,350

 
$
2,162

 
$
1,188

_________________
(1) Associated with impaired assets.