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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of reclassifications of the prior year | The following tables show the impacts of the reclassifications of the prior year (previously reported) amounts (dollars in thousands):
Pinnacle West Capital Corporation Consolidated Balance Sheets- December 31, 2016 | As previously reported |  | Reclassifications to conform to current year presentation |  | Amount reported after reclassification to conform to current year presentation
Accumulated other comprehensive loss: |  |  |  |  |
Pension and other postretirement benefits | $ | (39,070 | ) |  | $ | 39,070 |  |  | $ | — |
Derivative instruments | (4,752 | ) |  | 4,752 |  |  | — |
Total accumulated other comprehensive loss | (43,822 | ) |  | 43,822 |  |  | — |
Accumulated other comprehensive loss | — |  |  | (43,822 | ) |  | (43,822 | )
Arizona Public Service Company Consolidated Balance Sheets - December 31, 2016 | As previously reported |  | Reclassifications to conform to current year presentation |  | Amount reported after reclassification to conform to current year presentation
Accumulated other comprehensive loss: |  |  |  |  |
Pension and other postretirement benefits | $ | (20,671 | ) |  | $ | 20,671 |  |  | $ | — |
Derivative instruments | (4,752 | ) |  | 4,752 |  |  | — |
Total accumulated other comprehensive loss | (25,423 | ) |  | 25,423 |  |  | — |
Accumulated other comprehensive loss | — |  |  | (25,423 | ) |  | (25,423 | )
Schedule of property, plant and equipment | Pinnacle West’s property, plant and equipment included in the December 31, 2017 and 2016 Consolidated Balance Sheets is composed of the following (dollars in thousands):
Property, Plant and Equipment: | 2017 |  | 2016
Generation | $ | 7,963,998 |  |  | $ | 7,874,898 |
Transmission | 2,836,578 |  |  | 2,746,508 |
Distribution | 6,025,856 |  |  | 5,738,801 |
General plant | 971,629 |  |  | 981,681 |
Plant in service and held for future use | 17,798,061 |  |  | 17,341,888 |
Accumulated depreciation and amortization | (6,128,535 | ) |  | (5,970,100 | )
Net | 11,669,526 |  |  | 11,371,788 |
Construction work in progress | 1,291,498 |  |  | 1,019,947 |
Palo Verde sale leaseback, net of accumulated depreciation | 109,645 |  |  | 113,515 |
Intangible assets, net of accumulated amortization | 257,189 |  |  | 90,022 |
Nuclear fuel, net of accumulated amortization | 117,408 |  |  | 119,004 |
Total property, plant and equipment | $ | 13,445,266 |  |  | $ | 12,714,276 |
Summary of supplemental cash flow information | The following table summarizes supplemental Pinnacle West cash flow information for each of the last three years (dollars in thousands):
| Year ended December 31,
| 2017 |  | 2016 |  | 2015
Cash paid during the period for: |  |  |  |  |  |  |  |
Income taxes, net of refunds | $ | 2,186 |  |  | $ | 9,956 |  |  | $ | 6,550 |
Interest, net of amounts capitalized | 189,288 |  |  | 184,462 |  |  | 170,209 |
Significant non-cash investing and financing activities: |  |  |  |  |  |  |  |
Accrued capital expenditures | $ | 130,404 |  |  | $ | 114,855 |  |  | $ | 83,798 |
Dividends declared but not paid | 77,667 |  |  | 72,926 |  |  | 69,363 |

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