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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2017 | Jun. 30, 2018
Income Taxes |  |
Reduction in net deferred income tax liabilities | $ 1,140,000 |
Regulatory liabilities, non-current | 2,452,536 | $ 2,389,002
APS |  |
Income Taxes |  |
Reduction in net deferred income tax liabilities | 1,140,000 |
Regulatory liabilities, non-current | 2,452,536 | $ 2,389,002
Gross-up for revenue requirement of rate regulation | 377,000 |
Excess deferred income taxes - ACC - Tax Cuts and Jobs Act | APS |  |
Income Taxes |  |
Regulatory liabilities, non-current | $ 1,520,000 |

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