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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | $ 419,900 | $ 400,374 | $ 1,112,398 | $ 1,026,726 |
Cost of energy | 103,748 | 108,766 | 310,818 | 282,498 |
Utility margin | 316,152 | 291,608 | 801,580 | 744,228 |
Other operating expenses | 114,847 | 130,520 | 345,202 | 376,028 |
Depreciation and amortization | 58,821 | 53,017 | 172,829 | 153,801 |
Operating income | 142,484 | 108,071 | 283,549 | 214,399 |
Interest income | 3,582 | 4,604 | 12,348 | 18,420 |
Other income (deductions) | 7,110 | 5,651 | 21,398 | 17,927 |
Interest charges | (32,106) | (32,467) | (96,137) | (97,179) |
Earnings before Income Taxes | 121,070 | 85,859 | 221,158 | 153,567 |
Income taxes (benefit) | 42,743 | 27,303 | 75,154 | 50,094 |
Net Earnings | 78,327 | 58,556 | 146,004 | 103,473 |
Valencia non-controlling interest | (4,456) | (4,006) | (11,452) | (11,037) |
Subsidiary preferred stock dividends | (132) | (132) | (396) | (396) |
Net Earnings Available for PNM Common Stock | 73,739 | 54,418 | 134,156 | 92,040 |
Total Assets | 6,697,254 | 6,403,670 | 6,697,254 | 6,403,670 | $ 6,471,080
Goodwill | 278,297 | 278,297 | 278,297 | 278,297 | $ 278,297
PNM |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 327,254 | 311,276 | 854,909 | 780,228 |
Cost of energy | 82,367 | 88,565 | 246,635 | 222,376 |
Utility margin | 244,887 | 222,711 | 608,274 | 557,852 |
Other operating expenses | 94,871 | 109,342 | 288,300 | 314,961 |
Depreciation and amortization | 36,764 | 33,312 | 109,228 | 97,778 |
Operating income | 113,252 | 80,057 | 210,746 | 145,113 |
Interest income | 1,782 | 1,509 | 6,457 | 8,549 |
Other income (deductions) | 6,342 | 4,980 | 19,924 | 17,305 |
Interest charges | (20,451) | (22,213) | (62,393) | (66,494) |
Earnings before Income Taxes | 100,925 | 64,333 | 174,734 | 104,473 |
Income taxes (benefit) | 35,642 | 19,343 | 58,865 | 32,131 |
Net Earnings | 65,283 | 44,990 | 115,869 | 72,342 |
Valencia non-controlling interest | (4,456) | (4,006) | (11,452) | (11,037) |
Subsidiary preferred stock dividends | (132) | (132) | (396) | (396) |
Net Earnings Available for PNM Common Stock | 60,695 | 40,852 | 104,021 | 60,909 |
Total Assets | 5,023,816 | 4,799,012 | 5,023,816 | 4,799,012 |
Goodwill | 51,632 | 51,632 | 51,632 | 51,632 |
TNMP |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 92,646 | 89,098 | 257,489 | 246,498 |
Cost of energy | 21,381 | 20,201 | 64,183 | 60,122 |
Utility margin | 71,265 | 68,897 | 193,306 | 186,376 |
Other operating expenses | 25,367 | 24,184 | 72,188 | 70,328 |
Depreciation and amortization | 16,424 | 16,354 | 47,392 | 45,760 |
Operating income | 29,474 | 28,359 | 73,726 | 70,288 |
Interest income | 0 | 0 | 0 | 0 |
Other income (deductions) | 1,228 | 855 | 2,392 | 2,139 |
Interest charges | (7,704) | (7,308) | (22,619) | (22,150) |
Earnings before Income Taxes | 22,998 | 21,906 | 53,499 | 50,277 |
Income taxes (benefit) | 8,271 | 8,053 | 18,964 | 18,460 |
Net Earnings | 14,727 | 13,853 | 34,535 | 31,817 |
Valencia non-controlling interest | 0 | 0 | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 | 0 | 0 |
Net Earnings Available for PNM Common Stock | 14,727 | 13,853 | 34,535 | 31,817 |
Total Assets | 1,465,219 | 1,366,840 | 1,465,219 | 1,366,840 |
Goodwill | 226,665 | 226,665 | 226,665 | 226,665 |
Corporate and Other |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 0 | 0 | 0 | 0 |
Cost of energy | 0 | 0 | 0 | 0 |
Utility margin | 0 | 0 | 0 | 0 |
Other operating expenses | (5,391) | (3,006) | (15,286) | (9,261) |
Depreciation and amortization | 5,633 | 3,351 | 16,209 | 10,263 |
Operating income | (242) | (345) | (923) | (1,002) |
Interest income | 1,800 | 3,095 | 5,891 | 9,871 |
Other income (deductions) | (460) | (184) | (918) | (1,517) |
Interest charges | (3,951) | (2,946) | (11,125) | (8,535) |
Earnings before Income Taxes | (2,853) | (380) | (7,075) | (1,183) |
Income taxes (benefit) | (1,170) | (93) | (2,675) | (497) |
Net Earnings | (1,683) | (287) | (4,400) | (686) |
Valencia non-controlling interest | 0 | 0 | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 | 0 | 0 |
Net Earnings Available for PNM Common Stock | (1,683) | (287) | (4,400) | (686) |
Total Assets | 208,219 | 237,818 | 208,219 | 237,818 |
Goodwill | $ 0 | $ 0 | $ 0 | $ 0 |

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