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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | $ 400,374 | $ 417,433 | $ 1,026,726 | $ 1,103,187 |
Cost of energy | 108,766 | 124,255 | 282,498 | 353,939 |
Utility margin | 291,608 | 293,178 | 744,228 | 749,248 |
Other operating expenses | 130,520 | 124,170 | 376,028 | 366,748 |
Depreciation and amortization | 53,017 | 47,503 | 153,801 | 139,013 |
Operating income | 108,071 | 121,505 | 214,399 | 243,487 |
Interest income | 4,604 | 1,151 | 18,420 | 4,842 |
Other income (deductions) | 5,651 | 5,479 | 17,927 | 18,369 |
Interest charges | (32,467) | (27,528) | (97,179) | (86,714) |
Earnings before Income Taxes | 85,859 | 100,607 | 153,567 | 179,984 |
Income taxes (benefit) | 27,303 | 35,752 | 50,094 | 61,621 |
Net Earnings | 58,556 | 64,855 | 103,473 | 118,363 |
Valencia non-controlling interest | (4,006) | (3,678) | (11,037) | (10,909) |
Subsidiary preferred stock dividends | (132) | (132) | (396) | (396) |
Net Earnings Available for PNM Common Stock | 54,418 | 61,045 | 92,040 | 107,058 |
Total Assets | 6,403,670 | 6,012,582 | 6,403,670 | 6,012,582 | $ 6,009,328
Goodwill | 278,297 | 278,297 | 278,297 | 278,297 | $ 278,297
Public Service Company of New Mexico [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 311,276 | 333,437 | 780,228 | 870,826 |
Cost of energy | 88,565 | 105,708 | 222,376 | 299,302 |
Utility margin | 222,711 | 227,729 | 557,852 | 571,524 |
Other operating expenses | 109,342 | 104,977 | 314,961 | 312,534 |
Depreciation and amortization | 33,312 | 29,042 | 97,778 | 86,446 |
Operating income | 80,057 | 93,710 | 145,113 | 172,544 |
Interest income | 1,509 | 1,152 | 8,549 | 4,869 |
Other income (deductions) | 4,980 | 5,289 | 17,305 | 18,547 |
Interest charges | (22,213) | (19,837) | (66,494) | (59,477) |
Earnings before Income Taxes | 64,333 | 80,314 | 104,473 | 136,483 |
Income taxes (benefit) | 19,343 | 27,258 | 32,131 | 44,560 |
Net Earnings | 44,990 | 53,056 | 72,342 | 91,923 |
Valencia non-controlling interest | (4,006) | (3,678) | (11,037) | (10,909) |
Subsidiary preferred stock dividends | (132) | (132) | (396) | (396) |
Net Earnings Available for PNM Common Stock | 40,852 | 49,246 | 60,909 | 80,618 |
Total Assets | 4,799,012 | 4,615,442 | 4,799,012 | 4,615,442 |
Goodwill | 51,632 | 51,632 | 51,632 | 51,632 |
Texas-New Mexico Power Company [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 89,098 | 83,996 | 246,498 | 232,361 |
Cost of energy | 20,201 | 18,547 | 60,122 | 54,637 |
Utility margin | 68,897 | 65,449 | 186,376 | 177,724 |
Other operating expenses | 24,184 | 22,766 | 70,328 | 65,332 |
Depreciation and amortization | 16,354 | 15,016 | 45,760 | 42,065 |
Operating income | 28,359 | 27,667 | 70,288 | 70,327 |
Interest income | 0 | 0 | 0 | 0 |
Other income (deductions) | 855 | 672 | 2,139 | 2,757 |
Interest charges | (7,308) | (6,855) | (22,150) | (20,636) |
Earnings before Income Taxes | 21,906 | 21,484 | 50,277 | 52,448 |
Income taxes (benefit) | 8,053 | 7,795 | 18,460 | 19,200 |
Net Earnings | 13,853 | 13,689 | 31,817 | 33,248 |
Valencia non-controlling interest | 0 | 0 | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 | 0 | 0 |
Net Earnings Available for PNM Common Stock | 13,853 | 13,689 | 31,817 | 33,248 |
Total Assets | 1,366,840 | 1,282,766 | 1,366,840 | 1,282,766 |
Goodwill | 226,665 | 226,665 | 226,665 | 226,665 |
Corporate and Other [Member] |  |  |  |  |
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 | (3,006) | (3,573) | (9,261) | (11,118) |
Depreciation and amortization | 3,351 | 3,445 | 10,263 | 10,502 |
Operating income | (345) | 128 | (1,002) | 616 |
Interest income | 3,095 | (1) | 9,871 | (27) |
Other income (deductions) | (184) | (482) | (1,517) | (2,935) |
Interest charges | (2,946) | (836) | (8,535) | (6,601) |
Earnings before Income Taxes | (380) | (1,191) | (1,183) | (8,947) |
Income taxes (benefit) | (93) | 699 | (497) | (2,139) |
Net Earnings | (287) | (1,890) | (686) | (6,808) |
Valencia non-controlling interest | 0 | 0 | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 | 0 | 0 |
Net Earnings Available for PNM Common Stock | (287) | (1,890) | (686) | (6,808) |
Total Assets | 237,818 | 114,374 | 237,818 | 114,374 |
Goodwill | $ 0 | $ 0 | $ 0 | $ 0 |

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