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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments And Contingencies [Abstract]  
Schedule of minimum estimated commitment under purchase contracts The minimum estimated commitment under these contracts, except as noted below, is as follows:
As at December 31, 2020
20212022202320242025
Thereafter
$397,515$397,346$431,060$447,165$447,017$1,560,734
Contractual obligations
The Company has future minimum payments relating primarily to short-term vessel charters, terminal facilities, and other commitments that are not leases, as follows:

As at December 31, 2020
20212022202320242025
Thereafter
$64,768$3,304$539$539$539$2,571