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Adoption of new accounting standards - Disclosure of impact on transition on new accounting standards (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of initial application of standards or interpretations [line items]      
Lease assets presented in property, plant and equipment $ 34,507 $ 20,724 $ 11,345
Lease liabilities – current 9,913 5,636 2,978
Lease liabilities – non-current 15,143 12,706 6,538
Accounts receivable and other $ 75,290 80,434 80,987
Increase (decrease) due to application of IFRS 16      
Disclosure of initial application of standards or interpretations [line items]      
Lease assets presented in property, plant and equipment   9,379  
Lease liabilities – current   2,658  
Lease liabilities – non-current   6,168  
Accounts receivable and other   $ (553)  
Previously stated      
Disclosure of initial application of standards or interpretations [line items]      
Lease assets presented in property, plant and equipment     11,345
Lease liabilities – current     2,978
Lease liabilities – non-current     6,538
Accounts receivable and other     $ 80,987