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Variable Interest Entities (Details) $ in Thousands |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) MW | Mar. 31, 2016 USD ($) | May 02, 2017 USD ($) | May 01, 2017 USD ($) | Apr. 24, 2017 USD ($) | Dec. 31, 2016 USD ($)
Results of Operations |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | $ 3,452 | $ 3,287 |  |  |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 326,769 |  |  |  |  | $ 378,039
Total assets |  | 6,477,679 | 6,273,812 |  |  |  | 6,471,080
Current liabilities |  | 962,136 |  |  |  |  | 805,108
Owners’ equity – non-controlling interest |  | 68,344 |  |  |  |  | 68,920
Public Service Company of New Mexico |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  | 3,452 | 3,287 |  |  |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 281,309 |  |  |  |  | 314,245
Total assets |  | 4,870,201 |  |  |  |  | 4,867,546
Current liabilities |  | 451,156 |  |  |  |  | 457,361
Owners’ equity – non-controlling interest |  | 68,344 |  |  |  |  | 68,920
Public Service Company of New Mexico | Valencia |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payment for fixed costs |  | 4,900 | 4,800 |  |  |  |
Payment for variable costs |  | $ 100 | 200 |  |  |  |
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 |  | $ 4,927 | 4,937 |  |  |  |
Operating expenses |  | (1,475) | (1,650) |  |  |  |
Earnings attributable to non-controlling interest |  | 3,452 | $ 3,287 |  |  |  |
Financial Position |  |  |  |  |  |  |
Current assets |  | 2,841 |  |  |  |  | 2,551
Net property, plant, and equipment |  | 66,237 |  |  |  |  | 66,947
Total assets |  | 69,078 |  |  |  |  | 69,498
Current liabilities |  | 734 |  |  |  |  | 578
Owners’ equity – non-controlling interest |  | $ 68,344 |  |  |  |  | $ 68,920
Public Service Company of New Mexico | 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 |  |  |  |  |  |
Cash used to support bank letter or credit arrangement | 30,300 | $ 30,300 |  |  |  |  |
NM Capital | San Juan Coal Company, Westmoreland | Coal supply |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Loan receivable | $ 125,000 | 85,400 |  |  |  |  |
Interest receivable |  | $ 1,400 |  |  |  |  |
NM Capital | San Juan Coal Company, Westmoreland | Coal supply | Subsequent event |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Scheduled principal payment proceeds |  |  |  | $ 9,600 | $ 9,600 |  |
Scheduled interest payment proceeds |  |  |  | $ 2,200 | $ 2,200 |  |
Unaffiliated third party | San Juan Coal Company, Westmoreland | Coal supply | Subsequent event |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Amount held in a restricted bank account |  |  |  |  |  | $ 11,800 |

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