Asset retirement obligations (Tables)

9 Months Ended

Sep. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Asset retirement obligations

The following table provides a summary of our asset retirement obligation activity:

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		2,038
Liabilities settled and disposed in current period		(6,649	)
Revisions in estimated cash flows		708
Accretion expense		2,152
Liability for asset retirement obligations as of September 30, 2017 (Successor)	$	68,725
Less current portion included in accounts payable and accrued liabilities		8,111
Asset retirement obligations, long-term	$	60,614