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Non-cash operating items (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| 2017 |  | 2016
Accounts receivable | $ | (18,502 | ) |  | $ | 6,612 |
Fuel and natural gas in storage | (1,970 | ) |  | 6,877 |
Supplies and consumable inventory | 1,392 |  |  | 692 |
Income taxes receivable | 1,674 |  |  | 145 |
Prepaid expenses | (897 | ) |  | (6,161 | )
Accounts payable | (23,178 | ) |  | 24,524 |
Accrued liabilities | 25,122 |  |  | (9,454 | )
Current income tax liability | (3,432 | ) |  | (4,552 | )
Net regulatory assets and liabilities | (54,235 | ) |  | (14,979 | )
| $ | (74,026 | ) |  | $ | 3,704 |

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- Definition Tabular disclosure of noncash investing and financing activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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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