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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of Accounts Receivable

 
As at December 31,
(Thousands of U.S. Dollars)
2019
 
2018
Trade
$
24,890

 
$
16,332

Other
11,401

 
9,845

 
$
36,291

 
$
26,177