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Non-cash operating items (Tables) | 12 Months Ended
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Dec. 31, 2019
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:
| 2019 |  | 2018
Accounts receivable | $ | (20,857 | ) |  | $ | 3,005 |
Fuel and natural gas in storage | 13,985 |  |  | 1,351 |
Supplies and consumables inventory | (6,028 | ) |  | (7,189 | )
Income taxes recoverable | 17,796 |  |  | (763 | )
Prepaid expenses | (7,501 | ) |  | 2,907 |
Accounts payable | 63,854 |  |  | (22,915 | )
Accrued liabilities | 8,872 |  |  | 28,687 |
Current income tax liability | (5,016 | ) |  | 2,974 |
Asset retirements and environmental obligations | (2,494 | ) |  | (7,293 | )
Net regulatory assets and liabilities | (2,308 | ) |  | (8,890 | )
| $ | 60,303 |  |  | $ | (8,126 | )

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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=98513485&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=98513485&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=98513485&loc=d3e4304-108586 + Details
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