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Variable Interest Entities (Details) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Jun. 30, 2017 USD ($) MW | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) MW | Jun. 30, 2016 USD ($) | Jul. 25, 2017 USD ($) | Dec. 31, 2016 USD ($)
Results of Operations |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | $ 3,544,000 | $ 3,744,000 | $ 6,996,000 | $ 7,031,000 |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 353,587,000 |  | 353,587,000 |  |  | $ 378,039,000
Total assets |  | 6,584,445,000 | 6,360,456,000 | 6,584,445,000 | 6,360,456,000 |  | 6,471,080,000
Current liabilities |  | 766,570,000 |  | 766,570,000 |  |  | 805,108,000
Owners’ equity – non-controlling interest |  | 68,185,000 |  | 68,185,000 |  |  | 68,920,000
PNM |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | 3,544,000 | 3,744,000 | 6,996,000 | 7,031,000 |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 308,842,000 |  | 308,842,000 |  |  | 314,245,000
Total assets |  | 4,939,407,000 |  | 4,939,407,000 |  |  | 4,867,546,000
Current liabilities |  | 235,338,000 |  | 235,338,000 |  |  | 457,361,000
Owners’ equity – non-controlling interest |  | 68,185,000 |  | 68,185,000 |  |  | 68,920,000
PNM | Valencia |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payment for fixed costs |  | 4,900,000 | 4,800,000 | 9,800,000 | 9,600,000 |  |
Payment for variable costs |  | 200,000 | 400,000 | $ 300,000 | 600,000 |  |
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 |  | 5,094,000 | 5,248,000 | $ 10,021,000 | 10,185,000 |  |
Operating expenses |  | (1,550,000) | (1,504,000) | (3,025,000) | (3,154,000) |  |
Earnings attributable to non-controlling interest |  | 3,544,000 | $ 3,744,000 | 6,996,000 | $ 7,031,000 |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 3,322,000 |  | 3,322,000 |  |  | 2,551,000
Net property, plant, and equipment |  | 65,528,000 |  | 65,528,000 |  |  | 66,947,000
Total assets |  | 68,850,000 |  | 68,850,000 |  |  | 69,498,000
Current liabilities |  | 665,000 |  | 665,000 |  |  | 578,000
Owners’ equity – non-controlling interest |  | $ 68,185,000 |  | $ 68,185,000 |  |  | $ 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 | 75,800,000 |  | 75,800,000 |  |  |
Interest receivable |  | 1,300,000 |  | 1,300,000 |  |  |
Scheduled principal payment proceeds |  | 9,600,000 |  | 9,600,000 |  |  |
Scheduled interest payment proceeds |  | $ 2,000,000 |  | $ 2,000,000 |  |  |
Unaffiliated third party | San Juan Coal Company, Westmoreland | Coal supply | Subsequent event |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Amount held in a restricted bank account |  |  |  |  |  | $ 11,600,000 |

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