Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Share capital - Common shares issued narrative (Details)

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Share capital - Common shares issued narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Mar. 20, 2017
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2018
Disclosure of classes of share capital [line items]        
Net proceeds from issuance of common shares   $ 0 $ 162,324,000  
Bought Deal public offering [Abstract]        
Share issue costs, bought deal units     10,780,000  
Public Offering        
Disclosure of classes of share capital [line items]        
Number of shares issued, public offering 25,645      
Share issuance, price per share (in dollars per share) $ 6.75      
Net proceeds from issuance of common shares $ 173,104,000      
Commission rate to allocate share issue costs 6.00%      
Commission paid to placement agents and filing $ 10,386,000      
Bought Deal public offering [Abstract]        
Share issue costs, bought deal units $ 10,780,000      
Over-allotment offering        
Disclosure of classes of share capital [line items]        
Number of shares issued, public offering 3,345      
Common shares | ATM Facilities        
ATM Facilities [Abstract]        
Controlled equity offering       $ 30,000,000
Other income (expense) | Bought Deal Public Offering        
Bought Deal public offering [Abstract]        
Commission paid for legal and other professional fees, bought deal units     $ 655,000