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v3.8.0.1

Segment Information - Schedule (Details) - USD ($) $ 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] |  |  |  |  |  |  |  |  |  |  |
Electric 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
Cost of energy |  |  |  |  |  |  |  |  | 407,479 | 380,596 | 464,649
Utility margin |  |  |  |  |  |  |  |  | 1,037,524 | 982,355 | 974,433
Other operating expenses |  |  |  |  |  |  |  |  | 499,097 | 495,260 | 664,164
Depreciation and amortization |  |  |  |  |  |  |  |  | 231,942 | 209,110 | 185,919
Operating income | 22,936 | 142,484 | 85,105 | 55,960 | 63,584 | 108,071 | 64,822 | 41,508 | 306,485 | 277,985 | 124,350
Interest income |  |  |  |  |  |  |  |  | 15,916 | 22,293 | 6,498
Other income (deductions) |  |  |  |  |  |  |  |  | 30,983 | 23,529 | 30,165
Interest charges |  |  |  |  |  |  |  |  | (127,625) | (128,633) | (114,860)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 225,759 | 195,174 | 46,153
Income taxes |  |  |  |  |  |  |  |  | 130,340 | 63,278 | 15,075
Net Earnings | (50,585) | $ 78,327 | $ 41,231 | $ 26,446 | 28,423 | $ 58,556 | $ 30,952 | $ 13,965 | 95,419 | 131,896 | 31,078
Valencia non-controlling interest |  |  |  |  |  |  |  |  | (15,017) | (14,519) | (14,910)
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Segment earnings (loss) attributable to PNMR |  |  |  |  |  |  |  |  | 79,874 | 116,849 | 15,640
Total Assets | 6,646,103 |  |  |  | 6,471,080 |  |  |  | 6,646,103 | 6,471,080 | 6,009,328
Goodwill | 278,297 |  |  |  | 278,297 |  |  |  | 278,297 | 278,297 | 278,297
PNM |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Electric Operating Revenues |  |  |  |  |  |  |  |  | 1,104,230 | 1,035,913 | 1,131,195
Cost of energy |  |  |  |  |  |  |  |  | 321,677 | 299,714 | 391,131
Utility margin |  |  |  |  |  |  |  |  | 782,553 | 736,199 | 740,064
Other operating expenses |  |  |  |  |  |  |  |  | 423,011 | 414,662 | 590,967
Depreciation and amortization |  |  |  |  |  |  |  |  | 147,017 | 133,447 | 115,717
Operating income |  |  |  |  |  |  |  |  | 212,525 | 188,090 | 33,380
Interest income |  |  |  |  |  |  |  |  | 8,454 | 10,173 | 6,574
Other income (deductions) |  |  |  |  |  |  |  |  | 30,686 | 22,066 | 26,914
Interest charges |  |  |  |  |  |  |  |  | (82,697) | (87,469) | (79,950)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 168,968 | 132,860 | (13,082)
Income taxes |  |  |  |  |  |  |  |  | 81,555 | 40,922 | (12,758)
Net Earnings |  |  |  |  |  |  |  |  | 87,413 | 91,938 | (324)
Valencia non-controlling interest |  |  |  |  |  |  |  |  | (15,017) | (14,519) | (14,910)
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Segment earnings (loss) attributable to PNMR |  |  |  |  |  |  |  |  | 71,868 | 76,891 | (15,762)
Total Assets | 4,921,563 |  |  |  | 4,867,546 |  |  |  | 4,921,563 | 4,867,546 | 4,599,344
Goodwill | 51,632 |  |  |  | 51,632 |  |  |  | 51,632 | 51,632 | 51,632
TNMP |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Electric Operating Revenues |  |  |  |  |  |  |  |  | 340,773 | 327,038 | 307,887
Cost of energy |  |  |  |  |  |  |  |  | 85,802 | 80,882 | 73,518
Utility margin |  |  |  |  |  |  |  |  | 254,971 | 246,156 | 234,369
Other operating expenses |  |  |  |  |  |  |  |  | 98,221 | 93,389 | 88,051
Depreciation and amortization |  |  |  |  |  |  |  |  | 63,146 | 61,126 | 56,285
Operating income |  |  |  |  |  |  |  |  | 93,604 | 91,641 | 90,033
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income (deductions) |  |  |  |  |  |  |  |  | 3,551 | 3,202 | 3,736
Interest charges |  |  |  |  |  |  |  |  | (30,084) | (29,335) | (27,681)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 67,071 | 65,508 | 66,088
Income taxes |  |  |  |  |  |  |  |  | 31,512 | 23,836 | 24,125
Net Earnings |  |  |  |  |  |  |  |  | 35,559 | 41,672 | 41,963
Valencia non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment earnings (loss) attributable to PNMR |  |  |  |  |  |  |  |  | 35,559 | 41,672 | 41,963
Total Assets | 1,500,770 |  |  |  | 1,383,223 |  |  |  | 1,500,770 | 1,383,223 | 1,297,139
Goodwill | 226,665 |  |  |  | 226,665 |  |  |  | 226,665 | 226,665 | 226,665
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Electric Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of energy |  |  |  |  |  |  |  |  | 0 | 0 | 0
Utility margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operating expenses |  |  |  |  |  |  |  |  | (22,135) | (12,791) | (14,854)
Depreciation and amortization |  |  |  |  |  |  |  |  | 21,779 | 14,537 | 13,917
Operating income |  |  |  |  |  |  |  |  | 356 | (1,746) | 937
Interest income |  |  |  |  |  |  |  |  | 7,462 | 12,120 | (76)
Other income (deductions) |  |  |  |  |  |  |  |  | (3,254) | (1,739) | (485)
Interest charges |  |  |  |  |  |  |  |  | (14,844) | (11,829) | (7,229)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | (10,280) | (3,194) | (6,853)
Income taxes |  |  |  |  |  |  |  |  | 17,273 | (1,480) | 3,708
Net Earnings |  |  |  |  |  |  |  |  | (27,553) | (1,714) | (10,561)
Valencia non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment earnings (loss) attributable to PNMR |  |  |  |  |  |  |  |  | (27,553) | (1,714) | (10,561)
Total Assets | 223,770 |  |  |  | 220,311 |  |  |  | 223,770 | 220,311 | 112,845
Goodwill | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0

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