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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, 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
CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
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
Operating expenses |  |  |  |  |  |  |  |  | 2,642,698 | 2,640,841 | 2,680,390
OPERATING INCOME | 122,816 | 451,258 | 231,748 | 50,162 | 109,834 | 445,111 | 231,973 | 67,684 | 855,984 | 854,602 | 811,242
Other |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | 27,704 | 18,013 | 18,652
Interest expense |  |  |  |  |  |  |  |  | 205,720 | 194,964 | 200,950
Income tax benefit | 27,309 | 141,446 | 65,742 | 1,914 | 22,847 | 139,555 | 67,371 | 7,947 | 236,411 | 237,720 | 220,705
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
Other comprehensive income |  |  |  |  |  |  |  |  | 926 | 23,393 | 9,912
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | 442,960 | 460,650 | 407,507
Pinnacle West |  |  |  |  |  |  |  |  |  |  |
CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 370 | 550 | 642
Operating expenses |  |  |  |  |  |  |  |  | 26,424 | 12,733 | 23,507
OPERATING INCOME |  |  |  |  |  |  |  |  | (26,054) | (12,183) | (22,865)
Other |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 462,027 | 446,508 | 411,528
Other expense |  |  |  |  |  |  |  |  | (1,771) | (3,302) | (3,276)
Total |  |  |  |  |  |  |  |  | 460,256 | 443,206 | 408,252
Interest expense |  |  |  |  |  |  |  |  | 3,151 | 2,672 | 3,663
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 431,051 | 428,351 | 381,724
Income tax benefit |  |  |  |  |  |  |  |  | (10,983) | (8,906) | (15,871)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | 442,034 | 437,257 | 397,595
Other comprehensive income |  |  |  |  |  |  |  |  | 926 | 23,393 | 9,912
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | $ 442,960 | $ 460,650 | $ 407,507

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