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Other long-term liabilities
 6 Months Ended
Jun. 30, 2021
Other Liabilities Disclosure [Abstract]  
Other long-term liabilities Other long-term liabilities
Other long-term liabilities consist of the following: 
 June 30, 2021December 31, 2020
Contract adjustment payments (note 7(a))$222,429 $— 
Asset retirement obligations137,300 79,968 
Advances in aid of construction89,515 79,864 
Environmental remediation obligation63,260 69,383 
Customer deposits32,131 31,939 
Unamortized investment tax credits17,671 17,893 
Deferred credits21,685 21,399 
Preferred shares, Series C13,868 13,698 
Hook-up fees20,900 17,704 
Lease liabilities22,866 14,288 
Contingent development support obligations821 12,273 
Hedge settlement obligation32,576 — 
Note payable to related party— 30,493 
Other27,134 23,027 
$702,156 $411,929 
Less: current portion(154,161)(72,748)
$547,995 $339,181