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Supplemental cash flow information - Reconciliation of Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes from financing cash flows    
Repayment of long-term debt and financing fees $ (56,997) $ (48,417)
Payment of finance lease liabilities (6,880) (5,144)
Long term debt (note 8)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Outstanding at beginning of period 1,556,206  
Changes from financing cash flows    
Repayment of long-term debt and financing fees (56,997)  
Payment of finance lease liabilities 0  
Total changes from financing cash flows (56,997)  
Liability-related other changes    
Finance costs 3,062  
New finance leases 0  
Other 0  
Total liability-related other changes 3,062  
Outstanding at end of period 1,502,271 1,556,206
Finance lease obligations (note 9)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Outstanding at beginning of period 201,268  
Changes from financing cash flows    
Repayment of long-term debt and financing fees 0  
Payment of finance lease liabilities (6,880)  
Total changes from financing cash flows (6,880)  
Liability-related other changes    
Finance costs 0  
New finance leases 9,512  
Other 342  
Total liability-related other changes 9,854  
Outstanding at end of period $ 204,242 $ 201,268