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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 | APS | APS Common Stock | APS Additional Paid-In Capital | APS Retained Earnings | APS Accumulated Other Comprehensive Income (Loss) | APS Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  |  | (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 |  | 179,706 |  |  | 169,959 |  |  |  | 9,747 | 197,170 |  |  | 187,423 |  |  |  | 9,747
Other comprehensive loss |  | (3,070) |  |  |  |  | (3,070) |  |  | (3,138) |  |  |  |  | (3,138) |  |
Dividends on common stock |  | (155,620) |  |  | (155,620) |  |  |  |  | (155,599) |  |  | (155,599) |  |  |  |
Issuance of common stock (in shares) |  |  | 174,052 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 9,867 | $ 9,867 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  | 128,007 |  |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 10,470 |  | $ 10,470 | 0 |  |  |  | 0 |  |  |  |  |  |  |  |
Reclassification of income tax effects related to new tax reform |  | (8,552) |  |  | 8,552 | [2] | (8,552) | [2] |  |  |  |  | 5,038 | [3] | (5,038) | [3] |
Capital activities by noncontrolling interests |  | (11,372) |  |  |  |  |  |  | (11,372) | (11,372) |  |  |  |  |  |  | (11,372)
Ending balance (in shares) at Jun. 30, 2018 |  |  | (111,990,222) | (17,633) |  |  |  |  |  |  | (71,264,947) |  |  |  |  |  |
Balance at end of period at Jun. 30, 2018 |  | 5,159,434 | $ 2,624,672 | $ (1,431) | 2,465,402 |  | (56,624) |  | 127,415 | 5,412,930 | $ 178,162 | 2,571,696 | 2,570,816 |  | (35,159) |  | 127,415
Beginning balance (in shares) at Mar. 31, 2018 |  |  | (111,961,963) | (29,097) |  |  |  |  |  |  | (71,264,947) |  |  |  |  |  |
Balance at beginning 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
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 171,612 |  |  | 166,738 |  |  |  | 4,874 | 182,699 |  |  | 177,825 |  |  |  | 4,874
Other comprehensive loss |  | (4,283) |  |  |  |  | (4,283) |  |  | (4,308) |  |  |  |  | (4,308) |  |
Other |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  | (1)
Dividends on common stock |  | (155,604) |  |  | (155,604) |  |  |  |  | (155,600) |  |  | (155,600) |  |  |  |
Issuance of common stock (in shares) |  |  | 28,259 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 4,411 | $ 4,411 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 11,464 |  |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 999 |  | $ 1,000 | 0 |  |  |  | (1) |  |  |  |  |  |  |  |
Capital activities by noncontrolling interests |  | (11,372) |  |  |  |  |  |  | (11,372) | (11,372) |  |  |  |  |  |  | (11,372)
Ending balance (in shares) at Jun. 30, 2018 |  |  | (111,990,222) | (17,633) |  |  |  |  |  |  | (71,264,947) |  |  |  |  |  |
Balance at end of period at Jun. 30, 2018 |  | $ 5,159,434 | $ 2,624,672 | $ (1,431) | 2,465,402 |  | (56,624) |  | 127,415 | 5,412,930 | $ 178,162 | 2,571,696 | 2,570,816 |  | (35,159) |  | 127,415
Beginning balance (in shares) at Dec. 31, 2018 |  | (112,159,896) | (112,159,896) | (58,135) |  |  |  |  |  |  | (71,264,947) |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 |  | $ 5,348,705 | $ 2,634,265 | $ (4,825) | 2,641,183 |  | (47,708) |  | 125,790 | 5,786,797 | $ 178,162 | 2,721,696 | 2,788,256 |  | (27,107) |  | 125,790
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 171,810 |  |  | 162,063 |  |  |  | 9,747 | 188,199 |  |  | 178,452 |  |  |  | 9,747
Other comprehensive loss |  | 72 |  |  |  |  | 72 |  |  | (169) |  |  |  |  | (169) |  |
Dividends on common stock |  | (165,626) |  |  | (165,626) |  |  |  |  | (165,598) |  |  | (165,598) |  |  |  |
Issuance of common stock (in shares) |  |  | 201,699 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 13,969 | $ 13,969 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (75,791) |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (6,882) |  | $ (6,882) |  |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 75,707 |  |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 6,567 |  | $ 6,567 | 0 |  |  |  | 0 |  |  |  |  |  |  |  |
Capital activities by noncontrolling interests |  | $ (11,372) |  |  |  |  |  |  | (11,372) | (11,372) |  |  |  |  |  |  | (11,372)
Ending balance (in shares) at Jun. 30, 2019 |  | (112,361,595) | (112,361,595) | (58,219) |  |  |  |  |  |  | (71,264,947) |  |  |  |  |  |
Balance at end of period at Jun. 30, 2019 |  | $ 5,357,243 | $ 2,648,234 | $ (5,140) | 2,637,620 |  | (47,636) |  | 124,165 | 5,797,857 | $ 178,162 | 2,721,696 | 2,801,110 |  | (27,276) |  | 124,165
Beginning balance (in shares) at Mar. 31, 2019 |  |  | (112,340,322) | (63,271) |  |  |  |  |  |  | (71,264,947) |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2019 |  | 5,381,725 | $ 2,644,063 | $ (5,586) | 2,659,086 |  | (46,501) |  | 130,663 | 5,821,026 | $ 178,162 | 2,721,696 | 2,816,532 |  | (26,027) |  | 130,663
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 149,019 |  |  | 144,145 |  |  |  | 4,874 | 155,050 |  |  | 150,176 |  |  |  | 4,874
Other comprehensive loss |  | (1,135) |  |  |  |  | (1,135) |  |  | (1,249) |  |  |  |  | (1,249) |  |
Dividends on common stock |  | (165,611) |  |  | (165,611) |  |  |  |  | (165,598) |  |  | (165,598) |  |  |  |
Issuance of common stock (in shares) |  |  | 21,273 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 4,171 | $ 4,171 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other (in shares) |  |  |  | 5,052 |  |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of treasury stock for stock-based compensation and other |  | 446 |  | $ 446 | 0 |  |  |  | 0 |  |  |  |  |  |  |  |
Capital activities by noncontrolling interests |  | $ (11,372) |  |  |  |  |  |  | (11,372) | (11,372) |  |  |  |  |  |  | (11,372)
Ending balance (in shares) at Jun. 30, 2019 |  | (112,361,595) | (112,361,595) | (58,219) |  |  |  |  |  |  | (71,264,947) |  |  |  |  |  |
Balance at end of period at Jun. 30, 2019 |  | $ 5,357,243 | $ 2,648,234 | $ (5,140) | $ 2,637,620 |  | $ (47,636) |  | $ 124,165 | $ 5,797,857 | $ 178,162 | $ 2,721,696 | $ 2,801,110 |  | $ (27,276) |  | $ 124,165
[1] | Primarily represents shares of common stock withheld from certain stock awards for tax purposes.
[2] | In 2018, the Company adopted new accounting guidance and elected to reclassify income tax effects of the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) on items within accumulated other comprehensive income to retained earnings.
[3] | In 2018, the Company adopted new accounting guidance and elected to reclassify income tax effects of the Tax Act on items within accumulated other comprehensive income to retained earnings.

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