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Investments in and Advances to Equity Accounted Investments (Tables)
9 Months Ended
Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Investments in and Advances to Equity Accounted Investments
 
 
As at September 30, 2018
 
As at December 31, 2017
 
 
$
 
$
High-Q Joint Venture
 
24,811

 
24,546

Gemini Tankers L.L.C.
 

 
914

Total
 
24,811

 
25,460