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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data (Unaudited) | Selected Quarterly Financial Data (Unaudited) 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 |
Selected Quarterly Financial Data (Unaudited) - APS 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 The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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