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Variable Interest Entities (Details) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) MW | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) MW | Sep. 30, 2016 USD ($) | Oct. 20, 2017 USD ($) | Dec. 31, 2016 USD ($)
Results of Operations |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | $ 4,456,000 | $ 4,006,000 | $ 11,452,000 | $ 11,037,000 |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 374,535,000 |  | 374,535,000 |  |  | $ 378,039,000
Total assets |  | 6,697,254,000 | 6,403,670,000 | 6,697,254,000 | 6,403,670,000 |  | 6,471,080,000
Current liabilities |  | 710,885,000 |  | 710,885,000 |  |  | 805,108,000
Owners’ equity – non-controlling interest |  | 67,409,000 |  | 67,409,000 |  |  | 68,920,000
PNM |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | 4,456,000 | 4,006,000 | 11,452,000 | 11,037,000 |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 331,618,000 |  | 331,618,000 |  |  | 314,245,000
Total assets |  | 5,023,816,000 |  | 5,023,816,000 |  |  | 4,867,546,000
Current liabilities |  | 191,066,000 |  | 191,066,000 |  |  | 457,361,000
Owners’ equity – non-controlling interest |  | 67,409,000 |  | 67,409,000 |  |  | 68,920,000
PNM | Valencia |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payment for fixed costs |  | 4,900,000 | 4,900,000 | 14,700,000 | 14,500,000 |  |
Payment for variable costs |  | 900,000 | 500,000 | $ 1,200,000 | 1,100,000 |  |
Long-term contract option to purchase, ownership percentage |  |  |  | 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 |  | 5,859,000 | 5,356,000 | $ 15,880,000 | 15,541,000 |  |
Operating expenses |  | (1,403,000) | (1,350,000) | (4,428,000) | (4,504,000) |  |
Earnings attributable to non-controlling interest |  | 4,456,000 | $ 4,006,000 | 11,452,000 | $ 11,037,000 |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 3,498,000 |  | 3,498,000 |  |  | 2,551,000
Net property, plant, and equipment |  | 64,818,000 |  | 64,818,000 |  |  | 66,947,000
Total assets |  | 68,316,000 |  | 68,316,000 |  |  | 69,498,000
Current liabilities |  | 907,000 |  | 907,000 |  |  | 578,000
Owners’ equity – non-controlling interest |  | $ 67,409,000 |  | $ 67,409,000 |  |  | $ 68,920,000
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] |  |  |  |  |  |  |
Loan receivable | $ 125,000,000 | 66,200,000 |  | 66,200,000 |  |  |
Interest receivable |  | 1,200,000 |  | 1,200,000 |  |  |
Scheduled principal payment proceeds |  | 9,600,000 |  | 9,600,000 |  |  |
Scheduled interest payment proceeds |  | $ 1,800,000 |  | $ 1,800,000 |  |  |
Unaffiliated third party | San Juan Coal Company, Westmoreland | Coal supply | Subsequent event |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Amount held in a restricted bank account |  |  |  |  |  | $ 11,400,000 |

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