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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests | ARIZONA PUBLIC SERVICE COMPANY | ARIZONA PUBLIC SERVICE COMPANY Common Stock | ARIZONA PUBLIC SERVICE COMPANY Additional Paid-In Capital | ARIZONA PUBLIC SERVICE COMPANY Retained Earnings | ARIZONA PUBLIC SERVICE COMPANY Accumulated Other Comprehensive Income (Loss) | ARIZONA PUBLIC SERVICE COMPANY Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 |  | $ 4,519,102 | $ 2,512,970 | $ (3,401) | $ 1,926,065 | $ (68,141) | $ 151,609 | $ 4,629,852 | $ 178,162 | $ 2,379,696 | $ 1,968,718 | $ (48,333) | $ 151,609
Beginning Balance (in shares) at Dec. 31, 2014 |  |  | 110,649,762 | 78,400 |  |  |  |  | 71,264,947 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 456,190 |  |  | 437,257 |  | 18,933 | 469,207 |  |  | 450,274 |  | 18,933
Other comprehensive income |  | 23,393 |  |  |  | 23,393 |  | 21,236 |  |  |  | 21,236 |
Dividends on common stock |  | (270,519) |  |  | (270,519) |  |  | (270,500) |  |  | (270,500) |  |
Other |  |  |  |  |  |  |  | 1 |  |  | 1 |  |
Issuance of common stock |  | 28,698 | $ 28,698 |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 445,640 |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (10,136) |  | $ (10,136) |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (154,751) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 7,731 |  | $ 7,731 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 118,121 |  |  |  |  |  |  |  |  |
Net capital activities by noncontrolling interests |  | (35,002) |  |  |  |  | (35,002) | (35,002) |  |  |  |  | (35,002)
Ending balance at Dec. 31, 2015 |  | 4,719,457 | $ 2,541,668 | $ (5,806) | 2,092,803 | (44,748) | 135,540 | 4,814,794 | $ 178,162 | 2,379,696 | 2,148,493 | (27,097) | 135,540
Ending Balance (in shares) at Dec. 31, 2015 |  |  | 111,095,402 | 115,030 |  |  |  |  | 71,264,947 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 461,527 |  |  | 442,034 |  | 19,493 | 481,634 |  |  | 462,141 |  | 19,493
Other comprehensive income |  | 926 |  |  |  | 926 |  | 1,674 |  |  |  | 1,674 |
Dividends on common stock |  | (284,765) |  |  | (284,765) |  |  | (284,800) |  |  | (284,800) |  |
Other |  |  |  |  |  |  |  | 0 |  |  | 0 |  |
Issuance of common stock |  | 13,982 | $ 13,982 |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 296,651 |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (9,087) |  | $ (9,087) |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (128,105) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 10,760 |  | $ 10,760 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 187,818 |  |  |  |  |  |  |  |  |
Equity infusion from Pinnacle West |  |  |  |  |  |  |  | 42,000 |  | 42,000 |  |  |
Net capital activities by noncontrolling interests |  | (22,743) |  |  |  |  | (22,743) | (22,743) |  |  |  |  | (22,743)
Ending balance at Dec. 31, 2016 |  | $ 4,935,912 | $ 2,596,030 | $ (4,133) | 2,255,547 | (43,822) | 132,290 | 5,037,970 | $ 178,162 | 2,421,696 | 2,331,245 | (25,423) | 132,290
Ending Balance (in shares) at Dec. 31, 2016 |  | 111,392,053 | 111,392,053 | 55,317 |  |  |  |  | 71,264,947 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation cumulative effect adjustments |  | $ 45,855 | $ 40,380 |  | 5,475 |  |  | 5,411 |  |  | 5,411 |  |
Net income |  | 507,949 |  |  | 488,456 |  | 19,493 | 523,802 |  |  | 504,309 |  | 19,493
Other comprehensive income |  | (1,180) |  |  |  | (1,180) |  | (1,560) |  |  |  | (1,560) |
Dividends on common stock |  | (301,492) |  |  | (301,492) |  |  | (301,600) |  |  | (301,600) |  |
Issuance of common stock |  | 18,775 | $ 18,775 |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 424,117 |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (17,755) |  | $ (17,755) |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (216,911) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 16,264 |  | $ 16,264 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 207,765 |  |  |  |  |  |  |  |  |
Equity infusion from Pinnacle West |  |  |  |  |  |  |  | 150,000 |  | 150,000 |  |  |
Net capital activities by noncontrolling interests |  | (22,743) |  |  |  |  | (22,743) | (22,743) |  |  |  |  | (22,743)
Ending balance at Dec. 31, 2017 |  | $ 5,135,730 | $ 2,614,805 | $ (5,624) | $ 2,442,511 | $ (45,002) | $ 129,040 | $ 5,385,869 | $ 178,162 | $ 2,571,696 | $ 2,533,954 | $ (26,983) | $ 129,040
Ending Balance (in shares) at Dec. 31, 2017 |  | 111,816,170 | 111,816,170 | 64,463 |  |  |  |  | 71,264,947 |  |  |  |
[1] | Primarily represents shares of common stock withheld from certain stock awards for tax purposes.

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