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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, 2014 |  |  | 110,649,762 | 78,400 |  |  |  |  | 71,264,947 |  |  |  |
Balance at end of period 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
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 20,727 |  |  | 16,122 |  | 4,605 | 24,473 |  |  | 19,868 |  | 4,605
Other comprehensive income |  | 1,759 |  |  |  | 1,759 |  | 1,857 |  |  |  | 1,857 |
Other |  |  |  |  |  |  |  | 1 |  |  | 1 |  |
Issuance of common stock (in shares) |  |  | 159,730 |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 10,277 | $ 10,277 |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (93,280) |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (6,095) |  | $ (6,095) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 109,896 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 7,237 |  | $ 7,230 | 7 |  |  |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2015 |  |  | 110,809,492 | 61,784 |  |  |  |  | 71,264,947 |  |  |  |
Balance at beginning of period at Mar. 31, 2015 |  | $ 4,553,007 | $ 2,523,247 | $ (2,266) | 1,942,194 | (66,382) | 156,214 | 4,656,183 | $ 178,162 | 2,379,696 | 1,988,587 | (46,476) | 156,214
Beginning balance (in shares) at Dec. 31, 2015 |  | 111,095,402 | 111,095,402 | 115,030 |  |  |  |  | 71,264,947 |  |  |  |
Balance at end 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 | 111,147,524 | 7,936 |  |  |  |  | 71,264,947 |  |  |  |
Balance at beginning 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
[1] | Primarily represents shares of common stock withheld from certain stock awards for tax purposes.

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