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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations The following table presents the balance and activity of the Company’s asset retirement obligations (in thousands):
 
Successor
 
 
Predecessor
 
Year Ended December 31, 2017
 
Period from October 2, 2016 through December 31, 2016
 
 
Period from January 1, 2016 through October 1, 2016
 
Year Ended December 31, 2015
Beginning balance
$
106,481

 
$
92,413

 
 
$
103,578

 
$
54,402

Liability incurred upon acquiring and drilling wells
1,336

 
121

 
 
505

 
1,662

Revisions in estimated cash flows(1)
(28,565
)
 
12,397

 
 
—

 
44,060

Liability settled or disposed in current period(2)
(11,308
)
 
(540
)
 
 
(36,979
)
 
(1,023
)
Accretion
9,600

 
2,090

 
 
4,365

 
4,477

Impact of fresh start accounting
—

 
—

 
 
20,944

 
—

Ending balance
77,544

 
106,481

 
 
92,413

 
103,578

Less: current portion
41,017

 
66,154

 
 
65,678

 
8,399

Asset retirement obligations, net of current
$
36,527

 
$
40,327

 
 
$
26,735

 
$
95,179

____________________
(1)
Revisions for the year ended December 31, 2017, the Successor 2016 Period and the year ended December 31, 2015 relate primarily to changes in estimated well lives and changes in oil and natural gas prices.
(2)
Liability settled or disposed for the Predecessor 2016 Period includes $34.1 million associated with the WTO Properties sold in January 2016.