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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 |  | 9,326 |  |  | 4,453 |  | 4,873 | 12,126 |  |  | 7,253 |  | 4,873
Other comprehensive income |  | 978 |  |  |  | 978 |  | 1,059 |  |  |  | 1,059 |
Other |  |  |  |  |  |  |  | 1 |  |  | 0 |  | 1
Issuance of common stock (in shares) |  |  | 52,122 |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 5,397 | $ 5,397 |  |  |  |  |  |  |  |  |  |
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) |  |  |  | 179,056 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 10,135 |  | $ 10,144 | (10) |  | 1 |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2016 |  |  | 111,147,524 | 7,936 |  |  |  |  | 71,264,947 |  |  |  |
Balance at end of period at Mar. 31, 2016 |  | $ 4,740,413 | $ 2,547,065 | $ (542) | 2,097,246 | (43,770) | 140,414 | 4,827,980 | $ 178,162 | 2,379,696 | 2,155,746 | (26,038) | 140,414
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 |  | 28,185 |  |  | 23,312 |  | 4,873 | 28,035 |  |  | 23,162 |  | 4,873
Other comprehensive income |  | 959 |  |  |  | 959 |  | 1,048 |  |  |  | 1,048 |
Other |  |  |  |  |  |  |  | (1) |  |  | (2) |  | 1
Issuance of common stock (in shares) |  |  | 194,995 |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | (988) | $ (988) |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (153,470) |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (12,141) |  | $ (12,141) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 179,592 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | $ 14,013 |  | $ 14,004 | 8 |  | 1 |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2017 |  | 111,587,048 | 111,587,048 | 29,195 |  |  |  |  | 71,264,947.000 |  |  |  |
Balance at end of period at Mar. 31, 2017 |  | $ 4,965,940 | $ 2,595,042 | $ (2,270) | $ 2,278,867 | $ (42,863) | $ 137,164 | $ 5,067,052 | $ 178,162 | $ 2,421,696 | $ 2,354,405 | $ (24,375) | $ 137,164
[1] | Primarily represents shares of common stock withheld from certain stock awards for tax purposes.

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