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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2017
Segment Reporting [Abstract] |
Summary of Financial Information by Segment | The following tables present summarized financial information for PNMR by segment. PNM and TNMP each operate in only one segment. Therefore, tabular segment information is not presented for PNM and TNMP. PNMR SEGMENT INFORMATION
| PNM |  | TNMP |  | Corporate and Other |  | Consolidated
| (In thousands)
Three Months Ended September 30, 2017 |
Electric operating revenues | $ | 327,254 |  |  | $ | 92,646 |  |  | $ | — |  |  | $ | 419,900 |
Cost of energy | 82,367 |  |  | 21,381 |  |  | — |  |  | 103,748 |
Utility margin | 244,887 |  |  | 71,265 |  |  | — |  |  | 316,152 |
Other operating expenses | 94,871 |  |  | 25,367 |  |  | (5,391 | ) |  | 114,847 |
Depreciation and amortization | 36,764 |  |  | 16,424 |  |  | 5,633 |  |  | 58,821 |
Operating income (loss) | 113,252 |  |  | 29,474 |  |  | (242 | ) |  | 142,484 |
Interest income | 1,782 |  |  | — |  |  | 1,800 |  |  | 3,582 |
Other income (deductions) | 6,342 |  |  | 1,228 |  |  | (460 | ) |  | 7,110 |
Interest charges | (20,451 | ) |  | (7,704 | ) |  | (3,951 | ) |  | (32,106 | )
Segment earnings (loss) before income taxes | 100,925 |  |  | 22,998 |  |  | (2,853 | ) |  | 121,070 |
Income taxes (benefit) | 35,642 |  |  | 8,271 |  |  | (1,170 | ) |  | 42,743 |
Segment earnings (loss) | 65,283 |  |  | 14,727 |  |  | (1,683 | ) |  | 78,327 |
Valencia non-controlling interest | (4,456 | ) |  | — |  |  | — |  |  | (4,456 | )
Subsidiary preferred stock dividends | (132 | ) |  | — |  |  | — |  |  | (132 | )
Segment earnings (loss) attributable to PNMR | $ | 60,695 |  |  | $ | 14,727 |  |  | $ | (1,683 | ) |  | $ | 73,739 |
Nine Months Ended September 30, 2017 |  |  |  |  |  |  |
Electric operating revenues | $ | 854,909 |  |  | $ | 257,489 |  |  | $ | — |  |  | $ | 1,112,398 |
Cost of energy | 246,635 |  |  | 64,183 |  |  | — |  |  | 310,818 |
Utility margin | 608,274 |  |  | 193,306 |  |  | — |  |  | 801,580 |
Other operating expenses | 288,300 |  |  | 72,188 |  |  | (15,286 | ) |  | 345,202 |
Depreciation and amortization | 109,228 |  |  | 47,392 |  |  | 16,209 |  |  | 172,829 |
Operating income (loss) | 210,746 |  |  | 73,726 |  |  | (923 | ) |  | 283,549 |
Interest income | 6,457 |  |  | — |  |  | 5,891 |  |  | 12,348 |
Other income (deductions) | 19,924 |  |  | 2,392 |  |  | (918 | ) |  | 21,398 |
Interest charges | (62,393 | ) |  | (22,619 | ) |  | (11,125 | ) |  | (96,137 | )
Segment earnings (loss) before income taxes | 174,734 |  |  | 53,499 |  |  | (7,075 | ) |  | 221,158 |
Income taxes (benefit) | 58,865 |  |  | 18,964 |  |  | (2,675 | ) |  | 75,154 |
Segment earnings (loss) | 115,869 |  |  | 34,535 |  |  | (4,400 | ) |  | 146,004 |
Valencia non-controlling interest | (11,452 | ) |  | — |  |  | — |  |  | (11,452 | )
Subsidiary preferred stock dividends | (396 | ) |  | — |  |  | — |  |  | (396 | )
Segment earnings (loss) attributable to PNMR | $ | 104,021 |  |  | $ | 34,535 |  |  | $ | (4,400 | ) |  | $ | 134,156 |
At September 30, 2017: |  |  |  |  |  |  |
Total Assets | $ | 5,023,816 |  |  | $ | 1,465,219 |  |  | $ | 208,219 |  |  | $ | 6,697,254 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
| PNM |  | TNMP |  | Corporate and Other |  | Consolidated
| (In thousands)
Three Months Ended September 30, 2016 |  |  |  |  |  |  |
Electric operating revenues | $ | 311,276 |  |  | $ | 89,098 |  |  | $ | — |  |  | $ | 400,374 |
Cost of energy | 88,565 |  |  | 20,201 |  |  | — |  |  | 108,766 |
Utility margin | 222,711 |  |  | 68,897 |  |  | — |  |  | 291,608 |
Other operating expenses | 109,342 |  |  | 24,184 |  |  | (3,006 | ) |  | 130,520 |
Depreciation and amortization | 33,312 |  |  | 16,354 |  |  | 3,351 |  |  | 53,017 |
Operating income (loss) | 80,057 |  |  | 28,359 |  |  | (345 | ) |  | 108,071 |
Interest income | 1,509 |  |  | — |  |  | 3,095 |  |  | 4,604 |
Other income (deductions) | 4,980 |  |  | 855 |  |  | (184 | ) |  | 5,651 |
Interest charges | (22,213 | ) |  | (7,308 | ) |  | (2,946 | ) |  | (32,467 | )
Segment earnings (loss) before income taxes | 64,333 |  |  | 21,906 |  |  | (380 | ) |  | 85,859 |
Income taxes | 19,343 |  |  | 8,053 |  |  | (93 | ) |  | 27,303 |
Segment earnings (loss) | 44,990 |  |  | 13,853 |  |  | (287 | ) |  | 58,556 |
Valencia non-controlling interest | (4,006 | ) |  | — |  |  | — |  |  | (4,006 | )
Subsidiary preferred stock dividends | (132 | ) |  | — |  |  | — |  |  | (132 | )
Segment earnings (loss) attributable to PNMR | $ | 40,852 |  |  | $ | 13,853 |  |  | $ | (287 | ) |  | $ | 54,418 |
Nine Months Ended September 30, 2016 |  |  |  |  |  |  |
Electric operating revenues | $ | 780,228 |  |  | $ | 246,498 |  |  | $ | — |  |  | $ | 1,026,726 |
Cost of energy | 222,376 |  |  | 60,122 |  |  | — |  |  | 282,498 |
Utility margin | 557,852 |  |  | 186,376 |  |  | — |  |  | 744,228 |
Other operating expenses | 314,961 |  |  | 70,328 |  |  | (9,261 | ) |  | 376,028 |
Depreciation and amortization | 97,778 |  |  | 45,760 |  |  | 10,263 |  |  | 153,801 |
Operating income (loss) | 145,113 |  |  | 70,288 |  |  | (1,002 | ) |  | 214,399 |
Interest income | 8,549 |  |  | — |  |  | 9,871 |  |  | 18,420 |
Other income (deductions) | 17,305 |  |  | 2,139 |  |  | (1,517 | ) |  | 17,927 |
Interest charges | (66,494 | ) |  | (22,150 | ) |  | (8,535 | ) |  | (97,179 | )
Segment earnings (loss) before income taxes | 104,473 |  |  | 50,277 |  |  | (1,183 | ) |  | 153,567 |
Income taxes (benefit) | 32,131 |  |  | 18,460 |  |  | (497 | ) |  | 50,094 |
Segment earnings (loss) | 72,342 |  |  | 31,817 |  |  | (686 | ) |  | 103,473 |
Valencia non-controlling interest | (11,037 | ) |  | — |  |  | — |  |  | (11,037 | )
Subsidiary preferred stock dividends | (396 | ) |  | — |  |  | — |  |  | (396 | )
Segment earnings (loss) attributable to PNMR | $ | 60,909 |  |  | $ | 31,817 |  |  | $ | (686 | ) |  | $ | 92,040 |
At September 30, 2016: |  |  |  |  |  |  |
Total Assets | $ | 4,799,012 |  |  | $ | 1,366,840 |  |  | $ | 237,818 |  |  | $ | 6,403,670 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |

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