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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information | Consolidated quarterly financial information for 2019 and 2018 is provided in the tables below (dollars in thousands, except per share amounts). Weather conditions cause significant seasonal fluctuations in our revenues; therefore, results for interim periods do not necessarily represent results expected for the year.
| 2019 Quarter Ended |  | 2019
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 740,530 |  |  | $ | 869,501 |  |  | $ | 1,190,787 |  |  | $ | 670,391 |  |  | $ | 3,471,209 |
Operations and maintenance | 245,634 |  |  | 227,543 |  |  | 238,582 |  |  | 229,857 |  |  | 941,616 |
Operating income | 60,084 |  |  | 196,589 |  |  | 403,290 |  |  | 11,997 |  |  | 671,960 |
Income taxes | 2,418 |  |  | 17,080 |  |  | 53,266 |  |  | (88,537 | ) |  | (15,773 | )
Net income | 22,791 |  |  | 149,019 |  |  | 317,149 |  |  | 68,854 |  |  | 557,813 |
Net income attributable to common shareholders | 17,918 |  |  | 144,145 |  |  | 312,276 |  |  | 63,981 |  |  | 538,320 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders — Basic | $ | 0.16 |  |  | $ | 1.28 |  |  | $ | 2.78 |  |  | $ | 0.57 |  |  | $ | 4.79 |
Net income attributable to common shareholders — Diluted | 0.16 |  |  | 1.28 |  |  | 2.77 |  |  | 0.57 |  |  | 4.77 |
| 2018 Quarter Ended |  | 2018
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 692,714 |  |  | $ | 974,123 |  |  | $ | 1,268,034 |  |  | $ | 756,376 |  |  | $ | 3,691,247 |
Operations and maintenance | 265,682 |  |  | 268,397 |  |  | 246,545 |  |  | 256,120 |  |  | 1,036,744 |
Operating income | 31,334 |  |  | 242,162 |  |  | 433,307 |  |  | 66,884 |  |  | 773,687 |
Income taxes | (1,265 | ) |  | 44,039 |  |  | 84,333 |  |  | 6,795 |  |  | 133,902 |
Net income | 8,094 |  |  | 171,612 |  |  | 319,885 |  |  | 30,949 |  |  | 530,540 |
Net income attributable to common shareholders | 3,221 |  |  | 166,738 |  |  | 315,012 |  |  | 26,076 |  |  | 511,047 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders — Basic | $ | 0.03 |  |  | $ | 1.49 |  |  | $ | 2.81 |  |  | $ | 0.23 |  |  | $ | 4.56 |
Net income attributable to common shareholders — Diluted | 0.03 |  |  | 1.48 |  |  | 2.80 |  |  | 0.23 |  |  | 4.54 |
APS's quarterly financial information for 2019 and 2018 is as follows (dollars in thousands):
| 2019 Quarter Ended |  | 2019
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 740,530 |  |  | $ | 869,501 |  |  | $ | 1,190,787 |  |  | $ | 670,391 |  |  | $ | 3,471,209 |
Operations and maintenance | 240,375 |  |  | 224,143 |  |  | 235,440 |  |  | 226,758 |  |  | 926,716 |
Operating income | 65,377 |  |  | 200,018 |  |  | 406,465 |  |  | 15,124 |  |  | 686,984 |
Net income attributable to common shareholder | 28,276 |  |  | 150,176 |  |  | 318,870 |  |  | 67,949 |  |  | 565,271 |
| 2018 Quarter Ended |  | 2018
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 692,006 |  |  | $ | 971,963 |  |  | $ | 1,267,997 |  |  | $ | 756,376 |  |  | $ | 3,688,342 |
Operations and maintenance | 254,601 |  |  | 251,999 |  |  | 226,346 |  |  | 236,281 |  |  | 969,227 |
Operating income | 37,878 |  |  | 251,590 |  |  | 453,547 |  |  | 86,753 |  |  | 829,768 |
Net income attributable to common shareholder | 9,599 |  |  | 177,825 |  |  | 338,366 |  |  | 44,475 |  |  | 570,265 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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