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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - 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 (in shares) at Dec. 31, 2015 |  |  | 111,095,402 | 115,030 |  |  |  |  | 71,264,947 |  |  |  |
Balance at beginning of period 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
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 403,408 |  |  | 388,788 |  | 14,620 | 418,281 |  |  | 403,661 |  | 14,620
Other comprehensive income |  | 2,602 |  |  |  | 2,602 |  | 2,737 |  |  |  | 2,737 |
Dividends on common stock |  | (138,947) |  |  | (138,947) |  |  | (139,001) |  |  | (139,001) |  |
Issuance of common stock (in shares) |  |  | 124,968 |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 11,311 | $ 11,311 |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (71,962) |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (4,880) |  | $ (4,880) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 185,092 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 10,555 |  | $ 10,556 | (1) |  | 0 |  |  |  |  |  |
Capital activities by noncontrolling interests |  | (11,371) |  |  |  |  | (11,371) | (11,371) |  |  |  |  | (11,371)
Ending balance (in shares) at Sep. 30, 2016 |  |  | 111,220,370 | 1,900 |  |  |  |  | 71,264,947 |  |  |  |
Balance at end of period at Sep. 30, 2016 |  | 4,992,135 | $ 2,552,979 | $ (130) | 2,342,643 | (42,146) | 138,789 | 5,085,440 | $ 178,162 | 2,379,696 | 2,413,153 | (24,360) | 138,789
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 267,900 |  |  |  |  |  | 274,093 |  |  |  |  |
Other comprehensive income |  | 1,573 |  |  |  |  |  | 1,568 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2016 |  |  | 111,220,370 | 1,900 |  |  |  |  | 71,264,947 |  |  |  |
Balance at end of period at Sep. 30, 2016 |  | $ 4,992,135 | $ 2,552,979 | $ (130) | 2,342,643 | (42,146) | 138,789 | 5,085,440 | $ 178,162 | 2,379,696 | 2,413,153 | (24,360) | 138,789
Beginning balance (in shares) at Dec. 31, 2016 |  | 111,392,053 | 111,392,053 | 55,317 |  |  |  |  | 71,264,947 |  |  |  |
Balance at beginning of period 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
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 481,447 |  |  | 466,827 |  | 14,620 | 491,143 |  |  | 476,523 |  | 14,620
Other comprehensive income |  | 1,705 |  |  |  | 1,705 |  | 1,807 |  |  |  | 1,807 |
Other |  |  |  |  |  |  |  | 1 |  |  | 0 |  | 1
Dividends on common stock |  | (146,204) |  |  | (146,204) |  |  | (146,198) |  |  | (146,198) |  |
Issuance of common stock (in shares) |  |  | 274,823 |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 12,795 | $ 12,795 |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (162,312) |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (12,964) |  | $ (12,964) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 207,765 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 16,288 |  | $ 16,264 | 23 |  | 1 |  |  |  |  |  |
Capital activities by noncontrolling interests |  | $ (11,372) |  |  |  |  | (11,372) | (11,372) |  |  |  |  | (11,372)
Ending balance (in shares) at Sep. 30, 2017 |  | 111,666,876 | 111,666,876 | 9,864 |  |  |  |  | 71,264,947.000 |  |  |  |
Balance at end of period at Sep. 30, 2017 |  | $ 5,277,607 | $ 2,608,825 | $ (833) | 2,576,193 | (42,117) | 135,539 | 5,373,351 | $ 178,162 | 2,421,696 | 2,661,570 | (23,616) | 135,539
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 280,945 |  |  |  |  |  | 289,129 |  |  |  |  |
Other comprehensive income |  | $ 1,509 |  |  |  |  |  | 1,496 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2017 |  | 111,666,876 | 111,666,876 | 9,864 |  |  |  |  | 71,264,947.000 |  |  |  |
Balance at end of period at Sep. 30, 2017 |  | $ 5,277,607 | $ 2,608,825 | $ (833) | $ 2,576,193 | $ (42,117) | $ 135,539 | $ 5,373,351 | $ 178,162 | $ 2,421,696 | $ 2,661,570 | $ (23,616) | $ 135,539
[1] | Primarily represents shares of common stock withheld from certain stock awards for tax purposes.

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