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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurement Inputs and Valuation Techniques
The following table includes the estimated fair value and carrying value of those assets and liabilities that are measured at fair value on a recurring and non-recurring basis, as well as the estimated fair value of the Company’s financial instruments that are not accounted for at a fair value on a recurring basis.
December 31, 2023December 31, 2022
Fair Value
Hierarchy
Level 		Carrying
Amount
Asset (Liability)
$		Fair
Value
Asset (Liability)
$		Carrying
Amount
Asset (Liability)
$		Fair
Value
Asset (Liability)
$
Recurring
Cash, cash equivalents and restricted cashLevel 1480,771 480,771 316,706 316,706 
Short-term investmentsLevel 1172,604 172,604 210,000 210,000 
 Derivative instruments (note 9)
Interest rate swap agreements – assetsLevel 2— — 3,709 3,709 
Other
Advances to equity-accounted joint venture – long-term
Level 2
2,880 
(1)
6,780 
(1)
Long-term debt, including current portion – non-public (note 7)
Level 2— — (21,184)(21,078)
Obligations related to finance leases, including current portion
(note 8)
Level 2(139,599)(143,968)(532,760)(533,977)
(1)The advances to its equity-accounted joint venture, together with the Company’s investment in the equity-accounted joint venture, form the net aggregate carrying value of the Company’s interests in the equity-accounted joint venture in these consolidated financial statements. As at December 31, 2023 and December 31, 2022, the fair values of the individual components of such aggregate interests were not determinable.