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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Selected Quarterly Financial Information [Line Items] |
Selected Quarterly Financial Data (Unaudited) | Selected Quarterly Financial Data (Unaudited) Consolidated quarterly financial information for 2018 and 2017 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.
| 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 |
| 2017 Quarter Ended |  | 2017
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 677,728 |  |  | $ | 944,587 |  |  | $ | 1,183,322 |  |  | $ | 759,659 |  |  | $ | 3,565,296 |
Operations and maintenance | 226,071 |  |  | 220,985 |  |  | 230,839 |  |  | 271,212 |  |  | 949,107 |
Operating income | 67,411 |  |  | 297,257 |  |  | 459,548 |  |  | 85,547 |  |  | 909,763 |
Income taxes | 4,211 |  |  | 88,967 |  |  | 144,319 |  |  | 20,775 |  |  | 258,272 |
Net income | 28,185 |  |  | 172,317 |  |  | 280,945 |  |  | 26,502 |  |  | 507,949 |
Net income attributable to common shareholders | 23,312 |  |  | 167,443 |  |  | 276,072 |  |  | 21,629 |  |  | 488,456 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders — Basic | $ | 0.21 |  |  | $ | 1.50 |  |  | $ | 2.47 |  |  | $ | 0.19 |  |  | $ | 4.37 |
Net income attributable to common shareholders — Diluted | 0.21 |  |  | 1.49 |  |  | 2.46 |  |  | 0.19 |  |  | 4.35 |
ARIZONA PUBLIC SERVICE COMPANY |
Selected Quarterly Financial Information [Line Items] |
Selected Quarterly Financial Data (Unaudited) | Selected Quarterly Financial Data (Unaudited) - APS APS's quarterly financial information for 2018 and 2017 is as follows (dollars in thousands):
| 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 |
| 2017 Quarter Ended |  | 2017
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 677,589 |  |  | $ | 943,406 |  |  | $ | 1,178,846 |  |  | $ | 757,811 |  |  | $ | 3,557,652 |
Operations and maintenance | 219,008 |  |  | 215,775 |  |  | 222,374 |  |  | 260,826 |  |  | 917,983 |
Operating income | 70,269 |  |  | 296,700 |  |  | 465,658 |  |  | 91,912 |  |  | 924,539 |
Net income attributable to common shareholder | 23,162 |  |  | 169,108 |  |  | 284,256 |  |  | 27,783 |  |  | 504,309 |

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