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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
OPERATING REVENUES | $ 739,199 | $ 1,166,922 | $ 915,394 | $ 677,167 | $ 734,430 | $ 1,199,146 | $ 890,648 | $ 671,219 | $ 3,498,682 | $ 3,495,443 | $ 3,491,632
Operations and maintenance | 208,277 | 217,568 | 242,279 | 243,195 | 222,019 | 220,449 | 210,965 | 214,944 | 911,319 | 868,377 | 908,025
Operating income | 122,816 | 451,258 | 231,748 | 50,162 | 109,834 | 445,111 | 231,973 | 67,684 | 855,984 | 854,602 | 811,242
INCOME TAXES (Note 4) | 27,309 | 141,446 | 65,742 | 1,914 | 22,847 | 139,555 | 67,371 | 7,947 | 236,411 | 237,720 | 220,705
Net income | 58,119 | 267,900 | 126,182 | 9,326 | 45,978 | 261,978 | 127,507 | 20,727 | 461,527 | 456,190 | 423,696
Net income attributable to common shareholders | $ 53,246 | $ 263,027 | $ 121,308 | $ 4,453 | $ 41,117 | $ 257,116 | $ 122,902 | $ 16,122 | $ 442,034 | $ 437,257 | $ 397,595
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 0.48 | $ 2.36 | $ 1.09 | $ 0.04 | $ 0.37 | $ 2.32 | $ 1.11 | $ 0.15 | $ 3.97 | $ 3.94 | $ 3.59
Net income attributable to common shareholders — diluted (in dollars per share) | $ 0.47 | $ 2.35 | $ 1.08 | $ 0.04 | $ 0.37 | $ 2.30 | $ 1.10 | $ 0.14 | $ 3.95 | $ 3.92 | $ 3.58
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 737,006 | $ 1,166,359 | $ 909,757 | $ 676,632 | $ 733,586 | $ 1,198,380 | $ 889,723 | $ 670,668 | $ 3,489,754 | $ 3,492,357 | $ 3,488,946
Operations and maintenance | 197,319 | 209,366 | 233,712 | 238,711 | 219,146 | 216,011 | 208,031 | 209,947 | 879,108 | 853,135 | 882,442
Operating income | 95,765 | 307,601 | 165,684 | 48,930 | 86,709 | 301,238 | 162,704 | 61,333 | 617,980 | 611,984 | 592,792
INCOME TAXES (Note 4) |  |  |  |  |  |  |  |  | 245,842 | 245,841 | 237,360
Net income |  |  |  |  |  |  |  |  | 481,634 | 469,207 | 447,320
Net income attributable to common shareholders | $ 58,480 | $ 269,220 | $ 127,188 | $ 7,253 | $ 43,857 | $ 261,187 | $ 125,362 | $ 19,868 | $ 462,141 | $ 450,274 | $ 421,219

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