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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Statement of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 759,659 | $ 1,183,322 | $ 944,587 | $ 677,728 | $ 739,199 | $ 1,166,922 | $ 915,394 | $ 677,167 | $ 3,565,296 | $ 3,498,682 | $ 3,495,443
Operating expenses |  |  |  |  |  |  |  |  | 2,630,869 | 2,642,698 | 2,640,841
OPERATING INCOME | 90,610 | 466,082 | 304,229 | 73,506 | 122,816 | 451,258 | 231,748 | 50,162 | 934,427 | 855,984 | 854,602
Other |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | 29,478 | 27,704 | 18,013
Interest expense |  |  |  |  |  |  |  |  | 219,796 | 205,720 | 194,964
Income tax benefit | 20,775 | 144,319 | 88,967 | 4,211 | 27,309 | 141,446 | 65,742 | 1,914 | 258,272 | 236,411 | 237,720
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 21,629 | $ 276,072 | $ 167,443 | $ 23,312 | $ 53,246 | $ 263,027 | $ 121,308 | $ 4,453 | 488,456 | 442,034 | 437,257
Other comprehensive income |  |  |  |  |  |  |  |  | (1,180) | 926 | 23,393
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | 487,276 | 442,960 | 460,650
Pinnacle West |  |  |  |  |  |  |  |  |  |  |
CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 119 | 370 | 550
Operating expenses |  |  |  |  |  |  |  |  | 24,298 | 26,424 | 12,733
OPERATING INCOME |  |  |  |  |  |  |  |  | (24,179) | (26,054) | (12,183)
Other |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 507,495 | 462,027 | 446,508
Other expense |  |  |  |  |  |  |  |  | (2,715) | (1,771) | (3,302)
Total |  |  |  |  |  |  |  |  | 504,780 | 460,256 | 443,206
Interest expense |  |  |  |  |  |  |  |  | 5,633 | 3,151 | 2,672
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 474,968 | 431,051 | 428,351
Income tax benefit |  |  |  |  |  |  |  |  | (13,488) | (10,983) | (8,906)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | 488,456 | 442,034 | 437,257
Other comprehensive income |  |  |  |  |  |  |  |  | (1,180) | 926 | 23,393
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | $ 487,276 | $ 442,960 | $ 460,650

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