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Accounts Payable and Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities
 
Year Ended December 31,
(Thousands of U.S. Dollars)
2019
 
2018
Trade
$
151,747

 
$
123,905

Royalties
5,758

 
3,550

Employee compensation
6,861

 
8,195

Other
31,147

 
19,020

 
$
195,513

 
$
154,670