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Variable Interest Entities (Details) |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Mar. 31, 2018 USD ($) MW | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Oct. 20, 2017 USD ($) | Jun. 29, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Results of Operations |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | $ 3,677,000 | $ 3,452,000 |  |  |  |  |
Financial Position |  |  |  |  |  |  |  |
Current assets |  | 277,299,000 |  | $ 294,420,000 |  |  |  |
Total assets |  | 6,676,393,000 | 6,477,679,000 | 6,646,103,000 |  |  |  |
Current liabilities |  | 782,753,000 |  | 835,644,000 |  |  |  |
Owners’ equity – non-controlling interest |  | 65,400,000 |  | 66,195,000 |  |  |  |
PNM |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Amount held in a restricted bank account |  |  |  |  |  | $ 1,000,000 | $ 7,200,000 | $ 8,200,000
Results of Operations |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | 3,677,000 | 3,452,000 |  |  |  |  |
Financial Position |  |  |  |  |  |  |  |
Current assets |  | 228,821,000 |  | 243,631,000 |  |  |  |
Total assets |  | 4,925,741,000 |  | 4,921,563,000 |  |  |  |
Current liabilities |  | 416,312,000 |  | 218,496,000 |  |  |  |
Owners’ equity – non-controlling interest |  | 65,400,000 |  | 66,195,000 |  |  |  |
PNM | Valencia |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payment for fixed costs |  | 4,900,000 | 4,900,000 |  |  |  |  |
Payment for variable costs |  | $ 300,000 | 100,000 |  |  |  |  |
Long-term contract option to purchase, ownership percentage (up to) |  | 50.00% |  |  |  |  |  |
Long-term contract option to purchase, purchase price - percentage of adjusted NBV |  | 50.00% |  |  |  |  |  |
Long-term contract option to purchase, purchase price - percentage of FMV |  | 50.00% |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |
Operating revenues |  | $ 4,768,000 | 4,927,000 |  |  |  |  |
Operating expenses |  | (1,091,000) | (1,475,000) |  |  |  |  |
Earnings attributable to non-controlling interest |  | 3,677,000 | $ 3,452,000 |  |  |  |  |
Financial Position |  |  |  |  |  |  |  |
Current assets |  | 2,981,000 |  | 2,688,000 |  |  |  |
Net property, plant, and equipment |  | 63,400,000 |  | 64,109,000 |  |  |  |
Total assets |  | 66,381,000 |  | 66,797,000 |  |  |  |
Current liabilities |  | 981,000 |  | 602,000 |  |  |  |
Owners’ equity – non-controlling interest |  | $ 65,400,000 |  | $ 66,195,000 |  |  |  |
PNM | Valencia | Purchased through May 2028 |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of megawatts purchased (in megawatts) | MW |  | 158 |  |  |  |  |  |
NM Capital | San Juan Generating Station | Coal supply |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Loan agreement among several entities | $ 125,000,000.0 |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement | 30,300,000 | $ 30,300,000 |  |  |  |  |  |
NM Capital | San Juan Coal Company, Westmoreland | Coal supply |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Loan receivable | $ 125,000,000 | 51,000,000 |  |  |  |  |  |
Interest receivable |  | 1,200,000 |  |  |  |  |  |
Scheduled principal payment proceeds |  | 900,000 |  |  |  |  |  |
Scheduled interest payment proceeds |  | $ 1,800,000 |  |  |  |  |  |
Unaffiliated third party | San Juan Coal Company, Westmoreland | Coal supply |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Amount held in a restricted bank account |  |  |  |  | $ 2,700,000 |  |  |

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