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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, 2016 |  |  | 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 | 29,195 |  |  |  |  | 71,264,947 |  |  |  |
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
Beginning balance (in shares) at Dec. 31, 2017 |  | 111,816,170 | 111,816,170 | 64,463 |  |  |  |  | 71,264,947 |  |  |  |
Balance at beginning of period 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
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 8,094 |  |  | 3,221 |  | 4,873 | 14,472 |  |  | 9,599 |  | 4,873
Other comprehensive income |  | 1,213 |  |  |  | 1,213 |  | 1,170 |  |  |  | 1,170 |
Other |  |  |  |  |  |  |  | 1 |  |  | 0 |  | 1
Dividends on common stock |  | (16) |  |  | (16) |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 145,793 |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 5,456 | $ 5,456 |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (81,177) |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (6,277) |  | $ (6,277) |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 116,543 |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 9,471 |  | $ 9,470 | 0 |  | 1 |  |  |  |  |  |
Reclassification of income tax effects related to new tax reform (See Note 13) |  | $ 0 |  |  | 8,552 | (8,552) |  |  |  |  | 5,038 | (5,038) |
Ending balance (in shares) at Mar. 31, 2018 |  | 111,961,963 | 111,961,963 | 29,097 |  |  |  |  | 71,264,947.000 |  |  |  |
Balance at end of period at Mar. 31, 2018 |  | $ 5,153,671 | $ 2,620,261 | $ (2,431) | $ 2,454,268 | $ (52,341) | $ 133,914 | $ 5,401,512 | $ 178,162 | $ 2,571,696 | $ 2,548,591 | $ (30,851) | $ 133,914
[1] | Primarily represents shares of common stock withheld from certain stock awards for tax purposes.

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