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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CONDENSED FINANCIAL STATEMENTS |  |  |
Operating expenses | $ 2,998,525 | $ 2,798,830 | $ 2,799,249
Other |  |  |
Total | 173,982 | 89,044 | 86,803
Interest expense | 254,314 | 247,501 | 235,251
Income tax benefit | 110,086 | 78,173 | (15,773)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | 618,720 | 550,559 | 538,320
Other comprehensive income (loss) — attributable to common shareholders | 7,935 | (5,700) | (9,388)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | 626,655 | 544,859 | 528,932
Pinnacle West |  |  |
CONDENSED FINANCIAL STATEMENTS |  |  |
Operating expenses | 10,245 | 7,901 | 12,451
Other |  |  |
Equity in earnings of subsidiaries | 628,916 | 566,147 | 562,946
Other expense | (4,919) | (4,586) | (3,957)
Total | 623,997 | 561,561 | 558,989
Interest expense | 10,672 | 14,021 | 15,069
Income before income taxes | 603,080 | 539,639 | 531,469
Income tax benefit | (15,640) | (10,920) | (6,851)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | 618,720 | 550,559 | 538,320
Other comprehensive income (loss) — attributable to common shareholders | 7,935 | (5,700) | (9,388)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 626,655 | $ 544,859 | $ 528,932

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