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Quarterly Operating Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 332,605 | $ 419,900 | $ 362,320 | $ 330,178 | $ 336,225 | $ 400,374 | $ 315,391 | $ 310,961 | $ 1,445,003 | $ 1,362,951 | $ 1,439,082
Operating income | 22,936 | 142,484 | 85,105 | 55,960 | 63,584 | 108,071 | 64,822 | 41,508 | 306,485 | 277,985 | 124,350
Net earnings (loss) | (50,585) | 78,327 | 41,231 | 26,446 | 28,423 | 58,556 | 30,952 | 13,965 | 95,419 | 131,896 | 31,078
Net Earnings Attributable to PNMR | $ (54,282) | $ 73,739 | $ 37,555 | $ 22,862 | $ 24,809 | $ 54,418 | $ 27,076 | $ 10,546 | $ 79,874 | $ 116,849 | $ 15,640
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.68) | $ 0.92 | $ 0.47 | $ 0.29 | $ 0.32 | $ 0.68 | $ 0.34 | $ 0.13 | $ 1.00 | $ 1.47 | $ 0.20
Diluted (in dollars per share) | $ (0.68) | $ 0.92 | $ 0.47 | $ 0.29 | $ 0.31 | $ 0.68 | $ 0.34 | $ 0.13 | $ 1.00 | $ 1.46 | $ 0.20
Federal income tax rate change |  |  |  |  |  |  |  |  | $ 57,461 | $ 0 | $ 0
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 249,321 | $ 327,254 | $ 276,097 | $ 251,558 | $ 255,685 | $ 311,276 | $ 233,346 | $ 235,606 | 1,104,230 | 1,035,913 | 1,131,195
Operating income | 1,778 | 113,252 | 59,164 | 38,331 | 42,976 | 80,057 | 41,760 | 23,297 | 212,525 | 188,090 | 33,380
Net earnings (loss) | (28,456) | 65,283 | 30,476 | 20,110 | 19,594 | 44,990 | 19,793 | 7,561 | 87,413 | 91,938 | (324)
Net Earnings Attributable to PNMR | (32,021) | 60,827 | 26,932 | 16,658 | 16,112 | 40,984 | 16,049 | 4,274 | 72,396 | 77,419 | (15,234)
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |
Federal income tax rate change |  |  |  |  |  |  |  |  | 29,606 | 0 | 0
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 340,773 | 327,038 | 307,887
Operating revenues | 83,284 | 92,646 | 86,223 | 78,620 | 80,540 | 89,098 | 82,045 | 75,355 |  |  |
Operating income | 19,879 | 29,474 | 26,286 | 17,965 | 21,353 | 28,359 | 23,375 | 18,554 | 93,604 | 91,641 | 90,033
Net Earnings Attributable to PNMR | 1,024 | $ 14,727 | $ 12,204 | $ 7,604 | $ 9,855 | $ 13,853 | $ 10,508 | $ 7,456 | 35,559 | 41,672 | 41,963
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |
Federal income tax rate change |  |  |  |  |  |  |  |  | 7,865 | $ 0 | $ 0
NMPRC |  |  |  |  |  |  |  |  |  |  |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |
Pre-tax regulatory disallowance | $ 27,900 |  |  |  |  |  |  |  | $ 27,900 |  |

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