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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 18,375 | $ 11,624 | $ 8,630
State |  |  |  |  |  |  |  |  | 3,342 | 3,052 | 1,259
Total current |  |  |  |  |  |  |  |  | 21,717 | 14,676 | 9,889
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 94,721 | 223,729 | 201,743
State |  |  |  |  |  |  |  |  | 17,464 | 19,867 | 24,779
Total deferred |  |  |  |  |  |  |  |  | 112,185 | 243,596 | 226,522
Income tax expense | $ 6,795 | $ 84,333 | $ 44,039 | $ (1,265) | $ 20,775 | $ 144,319 | $ 88,967 | $ 4,211 | 133,902 | 258,272 | 236,411
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 88,180 | 21,512 | 711
State |  |  |  |  |  |  |  |  | 1,877 | 2,778 | 4,276
Total current |  |  |  |  |  |  |  |  | 90,057 | 24,290 | 4,987
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 32,436 | 221,078 | 215,178
State |  |  |  |  |  |  |  |  | 22,321 | 23,800 | 25,677
Total deferred |  |  |  |  |  |  |  |  | 54,757 | 244,878 | 240,855
Income tax expense |  |  |  |  |  |  |  |  | $ 144,814 | $ 269,168 | $ 245,842

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