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Other long-term liabilities | 6 Months Ended
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Jun. 30, 2020
Other Liabilities Disclosure [Abstract] |
Other long-term liabilities | Other long-term liabilities Other long-term liabilities consist of the following:
| June 30, 2020 |  | December 31, 2019
Advances in aid of construction | $ | 62,664 |  |  | $ | 60,828 |
Environmental remediation obligation | 66,446 |  |  | 58,061 |
Asset retirement obligations | 54,794 |  |  | 53,879 |
Customer deposits | 31,708 |  |  | 31,946 |
Unamortized investment tax credits | 18,051 |  |  | 18,234 |
Deferred credits | 18,856 |  |  | 18,952 |
Contingent development support obligations | 10,898 |  |  | 9,446 |
Preferred shares, Series C | 12,975 |  |  | 13,793 |
Lease liabilities | 14,248 |  |  | 9,695 |
Other | 29,293 |  |  | 26,506 |
| $ | 319,933 |  |  | $ | 301,340 |
Less: current portion | (56,944 | ) |  | (57,939 | )
| $ | 262,989 |  |  | $ | 243,401 |

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