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Quarterly Operating Results (Unaudited) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares MW | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares MW | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2015 MW
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 344,144 | $ 433,586 | $ 330,228 | $ 349,645 | $ 343,756 | $ 422,666 | $ 352,313 | $ 317,878 | $ 1,457,603 | $ 1,436,613 | $ 1,445,003 |
Operating income (loss) | 60,552 | 140,540 | (93,615) | 36,723 | (17,404) | 127,990 | 79,329 | 46,132 | 144,200 | 236,047 | 315,039 |
Net earnings (loss) | 35,989 | 106,763 | (72,283) | 21,662 | (51,539) | 91,573 | 42,449 | 18,799 | $ 92,131 | $ 101,282 | $ 95,419 |
Net Earnings Attributable to PNMR | $ 31,805 | $ 102,771 | $ (75,914) | $ 18,700 | $ (55,077) | $ 87,521 | $ 38,208 | $ 14,990 |  |  |  |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares | $ 0.40 | $ 1.29 | $ (0.95) | $ 0.23 | $ (0.70) | $ 1.10 | $ 0.48 | $ 0.19 | $ 0.97 | $ 1.07 | $ 1.00 |
Diluted (in dollars per share) | $ / shares | $ 0.40 | $ 1.28 | $ (0.95) | $ 0.23 | $ (0.69) | $ 1.09 | $ 0.48 | $ 0.19 | $ 0.97 | $ 1.07 | $ 1.00 |
Income taxes (benefit) |  |  |  |  |  |  |  |  | $ (25,282) | $ 7,775 | $ 130,340 |
Federal income tax rate change |  |  |  |  |  |  |  |  | 0 | 2,914 | 57,461 |
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 255,172 | $ 331,113 | $ 238,219 | $ 269,318 | $ 259,848 | $ 331,374 | $ 264,511 | $ 236,232 | 1,093,822 | 1,091,965 | 1,104,230 |
Operating income (loss) | 44,299 | 108,453 | (115,977) | 24,293 | (38,654) | 102,516 | 52,879 | 28,292 | 61,068 | 145,033 | 221,079 |
Net earnings (loss) | 32,040 | 84,721 | (83,313) | 21,974 | (53,400) | 81,428 | 30,781 | 11,514 | 55,422 | 70,323 | 87,413 |
Net Earnings Attributable to PNMR | 27,988 | 80,861 | (86,812) | 19,144 | (56,806) | 77,508 | 26,672 | 7,837 | 41,181 | 55,211 | 72,396 |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Income taxes (benefit) |  |  |  |  |  |  |  |  | (25,962) | (5,971) | 81,555 |
Federal income tax rate change |  |  |  |  |  |  |  |  | 0 | (683) | 29,606 |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 88,972 | 102,473 | 92,009 | 80,327 | 83,908 | 91,292 | 87,802 | 81,646 | 363,781 | 344,648 | 340,773 |
Operating income (loss) | 18,055 | 32,596 | 22,578 | 12,585 | 23,312 | 27,824 | 26,829 | 18,532 | 85,814 | 96,497 | 93,604 |
Net Earnings Attributable to PNMR | 11,347 | $ 25,087 | $ 15,267 | $ 4,098 | 10,711 | $ 16,100 | $ 15,367 | $ 9,413 | 55,799 | 51,591 | 35,559 |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Income taxes (benefit) |  |  |  |  |  |  |  |  | 5,046 | 16,880 | 31,512 |
Federal income tax rate change |  |  |  |  |  |  |  |  | 0 | 0 | 7,865 |
Electricity |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,457,603 | 1,436,613 | $ 1,445,003 |
Clean Air Act, SNCR | San Juan Generating Station Unit 4 | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of investments |  |  |  |  | $ 35,000 |  |  |  |  | 35,000 |  |
Regulatory disallowance and restructuring costs |  |  |  |  |  |  |  |  |  | $ 63,300 |  |
Additional ownership to be obtained (in megawatts) | MW |  |  |  |  |  |  |  |  |  |  |  | 132
Potential acquisition of ownership (in megawatts) | MW |  |  |  |  | 65 |  |  |  |  | 65 |  | 65
Clean Air Act, SNCR Hearing Examiner Recommended Denial | San Juan Generating Station Unit 4 | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership to be obtained (in megawatts) | MW |  |  |  |  | 132 |  |  |  |  | 132 |  | 132
New Mexico 2015 Rate Case | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of investments | $ 150,600 |  |  |  |  |  |  |  | 150,600 |  |  |
Income taxes (benefit) |  |  |  |  |  |  |  |  | $ 45,700 |  |  |

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