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Asset retirement obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset retirement obligations
The following table presents the balance and activity of our asset retirement obligations:
 
Liability for asset retirement obligations as of December 31, 2016 - Predecessor
$
72,137

Liabilities incurred in current period
535

Liabilities settled and disposed in current period
(869
)
Revisions in estimated cash flows
181

Accretion expense
1,249

Liability for asset retirement obligations as of March 21, 2017 - Predecessor
$
73,233

Fair value fresh-start adjustment
$
(2,757
)
Liability for asset retirement obligations as of March 21, 2017 - Successor
$
70,476

Liabilities incurred in current period
2,498

Liabilities settled and disposed in current period
(44,097
)
Revisions in estimated cash flows
4,248

Accretion expense
2,865

Liability for asset retirement obligations as of December 31, 2017 - Successor
$
35,990

Liabilities incurred in current period
689

Liabilities settled and disposed in current period
(17,868
)
Revisions in estimated cash flows
2,452

Accretion expense
1,884

Liability for asset retirement obligations as of December 31, 2018 - Successor
$
23,147

Less current portion included in accounts payable and accrued liabilities
1,057

Asset retirement obligations, long-term
$
22,090