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Other long-term liabilities and deferred credits (Tables) | 6 Months Ended
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Jun. 30, 2021
Other Liabilities Disclosure [Abstract] |
Other Long Term Liabilities | Other long-term liabilities consist of the following:
| June 30, 2021 |  | December 31, 2020
Contract adjustment payments (note 7(a)) | $ | 222,429 |  |  | $ | — |
Asset retirement obligations | 137,300 |  |  | 79,968 |
Advances in aid of construction | 89,515 |  |  | 79,864 |
Environmental remediation obligation | 63,260 |  |  | 69,383 |
Customer deposits | 32,131 |  |  | 31,939 |
Unamortized investment tax credits | 17,671 |  |  | 17,893 |
Deferred credits | 21,685 |  |  | 21,399 |
Preferred shares, Series C | 13,868 |  |  | 13,698 |
Hook-up fees | 20,900 |  |  | 17,704 |
Lease liabilities | 22,866 |  |  | 14,288 |
Contingent development support obligations | 821 |  |  | 12,273 |
Hedge settlement obligation | 32,576 |  |  | — |
Note payable to related party | — |  |  | 30,493 |
Other | 27,134 |  |  | 23,027 |
| $ | 702,156 |  |  | $ | 411,929 |
Less: current portion | (154,161) |  |  | (72,748) |
| $ | 547,995 |  |  | $ | 339,181 |

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