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Variable Interest Entities (Details) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 01, 2016 USD ($) | Jun. 30, 2018 USD ($) MW | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) MW | Jun. 30, 2017 USD ($) | May 22, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 31, 2016 USD ($)
Results of Operations |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | $ 4,109,000 | $ 3,544,000 | $ 7,786,000 | $ 6,996,000 |  |  |
Financial Position |  |  |  |  |  |  |  |
Current assets |  | 331,242,000 |  | 331,242,000 |  |  | $ 294,420,000 |
Total assets |  | 6,750,089,000 | 6,584,445,000 | 6,750,089,000 | 6,584,445,000 |  | 6,646,103,000 |
Current liabilities |  | 962,150,000 |  | 962,150,000 |  |  | 835,644,000 |
Owners’ equity – non-controlling interest |  | 65,600,000 |  | 65,600,000 |  |  | 66,195,000 |
PNM |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | 4,109,000 | 3,544,000 | 7,786,000 | 6,996,000 |  |  |
Financial Position |  |  |  |  |  |  |  |
Current assets |  | 281,110,000 |  | 281,110,000 |  |  | 243,631,000 |
Total assets |  | 4,994,277,000 |  | 4,994,277,000 |  |  | 4,921,563,000 |
Current liabilities |  | 392,261,000 |  | 392,261,000 |  |  | 218,496,000 |
Owners’ equity – non-controlling interest |  | 65,600,000 |  | 65,600,000 |  |  | 66,195,000 |
PNM | Valencia |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payment for fixed costs |  | 4,900,000 | 4,900,000 | 9,800,000 | 9,800,000 |  |  |
Payment for variable costs |  | 600,000 | 200,000 | $ 900,000 | 300,000 |  |  |
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 |  | 5,911,000 | 5,094,000 | $ 10,679,000 | 10,021,000 |  |  |
Operating expenses |  | (1,802,000) | (1,550,000) | (2,893,000) | (3,025,000) |  |  |
Earnings attributable to non-controlling interest |  | 4,109,000 | $ 3,544,000 | 7,786,000 | $ 6,996,000 |  |  |
Financial Position |  |  |  |  |  |  |  |
Current assets |  | 3,304,000 |  | 3,304,000 |  |  | 2,688,000 |
Net property, plant, and equipment |  | 62,975,000 |  | 62,975,000 |  |  | 64,109,000 |
Total assets |  | 66,279,000 |  | 66,279,000 |  |  | 66,797,000 |
Current liabilities |  | 679,000 |  | 679,000 |  |  | 602,000 |
Owners’ equity – non-controlling interest |  | $ 65,600,000 |  | $ 65,600,000 |  |  | $ 66,195,000 |
PNM | Valencia | Purchased through May 2028 |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of megawatts purchased (in megawatts) | MW |  | 158 |  | 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 |  |  |  | $ 30,300,000
NM Capital | San Juan Coal Company, Westmoreland | Coal supply |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Repayment of line of credit |  |  |  |  |  | $ 50,100,000 |  |

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