Asset retirement obligations (Tables)

3 Months Ended

Mar. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Summary of asset retirement obligations

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

Balance at January 1, 2020	$	23,156
Liabilities incurred in current period	41
Liabilities settled or disposed in current period	(63		)
Revisions in estimated cash flows	15
Accretion expense	323
Balance at March 31, 2020	$	23,472
Less current portion included in accounts payable and accrued liabilities	928
Asset retirement obligations, long-term	$	22,544