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Accounts Payable and Accrued Liabilities
 12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities
Year Ended December 31,
(Thousands of U.S. Dollars)20212020
Trade$91,101 $70,450 
Royalties14,761 1,570 
Employee compensation 4,382 1,701 
Other38,450 27,063 
$148,694 $100,784