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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2017
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Asset retirement obligation rollforward
(000s)
 
Balance at December 31, 2015
$
—

Acquisitions through business combination
12,089

Effect of movements in foreign exchange rates
10

Balance at December 31, 2016
$
12,099

Changes in estimates for asset retirement obligations
(236
)
Obligations settled
(695
)
Accretion expense
256

Effect of movements in foreign exchange rates
908

Balance at December 31, 2017
$
12,332