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Non-cash operating items | 12 Months Ended
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Dec. 31, 2017
Disclosure Changes In Non Cash Operating Items [Abstract] |
Non-cash operating items | 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 Disclosure of Other Significant Noncash Transactions. + References No definition available. + Details
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