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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 670,391 | $ 1,190,787 | $ 869,501 | $ 740,530 | $ 756,376 | $ 1,268,034 | $ 974,123 | $ 692,714 | $ 3,471,209 | $ 3,691,247 | $ 3,565,296
Operating expenses |  |  |  |  |  |  |  |  | 2,799,249 | 2,917,560 | 2,655,533
Operating loss | 11,997 | 403,290 | 196,589 | 60,084 | 66,884 | 433,307 | 242,162 | 31,334 | 671,960 | 773,687 | 909,763
Other |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | 86,803 | 109,040 | 54,142
Interest expense |  |  |  |  |  |  |  |  | 235,251 | 243,465 | 219,796
Income tax benefit | (88,537) | 53,266 | 17,080 | 2,418 | 6,795 | 84,333 | 44,039 | (1,265) | (15,773) | 133,902 | 258,272
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 63,981 | $ 312,276 | $ 144,145 | $ 17,918 | $ 26,076 | $ 315,012 | $ 166,738 | $ 3,221 | 538,320 | 511,047 | 488,456
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (9,388) | 5,846 | (1,180)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | 528,932 | 516,893 | 487,276
Pinnacle West |  |  |  |  |  |  |  |  |  |  |
CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 | 0 | 119
Operating expenses |  |  |  |  |  |  |  |  | 12,451 | 53,844 | 24,591
Operating loss |  |  |  |  |  |  |  |  | (12,451) | (53,844) | (24,472)
Other |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 562,946 | 569,249 | 507,495
Other expense |  |  |  |  |  |  |  |  | (3,957) | (3,202) | (2,422)
Total |  |  |  |  |  |  |  |  | 558,989 | 566,047 | 505,073
Interest expense |  |  |  |  |  |  |  |  | 15,069 | 12,074 | 5,633
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 531,469 | 500,129 | 474,968
Income tax benefit |  |  |  |  |  |  |  |  | (6,851) | (10,918) | (13,488)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | 538,320 | 511,047 | 488,456
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (9,388) | 5,846 | (1,180)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | $ 528,932 | $ 516,893 | $ 487,276

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