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Non-cash operating items (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Changes In Non Cash Operating Items [Abstract] |
Changes in Non-Cash Operating Items | The changes in non-cash operating items consist of the following:
|  |  |  |  | 2020 |  | 2019
Accounts receivable |  |  |  |  | $ | (52,778) |  |  | $ | (20,857) |
Fuel and natural gas in storage |  |  |  |  | 237 |  |  | 13,985 |
Supplies and consumables inventory |  |  |  |  | 1,058 |  |  | (6,028) |
Income taxes recoverable |  |  |  |  | (3,440) |  |  | 17,796 |
Prepaid expenses |  |  |  |  | (15,411) |  |  | (7,501) |
Accounts payable |  |  |  |  | 40,885 |  |  | 63,854 |
Accrued liabilities |  |  |  |  | (29,150) |  |  | 8,872 |
Current income tax liability |  |  |  |  | 3,818 |  |  | (5,016) |
Asset retirements and environmental obligations |  |  |  |  | 3,562 |  |  | (2,494) |
Net regulatory assets and liabilities |  |  |  |  | (26,260) |  |  | (2,308) |
|  |  |  |  | $ | (77,479) |  |  | $ | 60,303 |

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- Definition Tabular disclosure of noncash investing and financing activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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