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Variable Interest Entities (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2016 USD ($) | Jan. 31, 2016 USD ($) | May 30, 2014 | Oct. 08, 2013 USD ($) | Jun. 30, 2016 USD ($) MW | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) MW | Jun. 30, 2015 USD ($) | Aug. 03, 2016 USD ($) | Jul. 19, 2016 USD ($) | Dec. 31, 2015 USD ($)
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  |  |  |  | $ 3,744 | $ 3,850 | $ 7,031 | $ 7,231 |  |  |
Financial Position |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  | 408,871 |  | 408,871 |  |  |  | $ 385,570
Total assets |  |  |  |  | 6,360,456 | 5,888,796 | 6,360,456 | 5,888,796 |  |  | 6,009,328
Current liabilities |  |  |  |  | 702,916 |  | 702,916 |  |  |  | 641,120
Owners’ equity – non-controlling interest |  |  |  |  | 71,044 |  | 71,044 |  |  |  | 71,407
Public Service Company of New Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  |  |  |  | 3,744 | 3,850 | 7,031 | 7,231 |  |  |
Financial Position |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  | 322,781 |  | 322,781 |  |  |  | 357,757
Total assets |  |  |  |  | 4,775,481 |  | 4,775,481 |  |  |  | 4,599,344
Current liabilities |  |  |  |  | 342,695 |  | 342,695 |  |  |  | 316,921
Owners’ equity – non-controlling interest |  |  |  |  | 71,044 |  | 71,044 |  |  |  | 71,407
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued lease payments |  |  |  |  | 8,300 |  | 8,300 |  |  |  | 18,400
Public Service Company of New Mexico [Member] | Valencia [Member] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment for fixed costs |  |  |  |  | 4,800 | 4,800 | 9,600 | 9,600 |  |  |
Payment for variable costs |  |  |  |  | 400 | 500 | $ 600 | 600 |  |  |
Long term contract option to purchase, ownership percentage |  |  | 50.00% | 50.00% |  |  | 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% |  |  |  |
Long term contract option to purchase, number of days to set FMV |  |  |  |  |  |  | 60 days |  |  |  |
Long term contract option to purchase, estimated purchase price |  |  |  | $ 85,000 |  |  |  |  |  |  |
Long term contract option to purchase, approximate approval period |  |  |  |  |  |  | 15 months |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  | 5,248 | 5,251 | $ 10,185 | 10,155 |  |  |
Operating expenses |  |  |  |  | (1,504) | (1,401) | (3,154) | (2,924) |  |  |
Earnings attributable to non-controlling interest |  |  |  |  | 3,744 | $ 3,850 | 7,031 | $ 7,231 |  |  |
Financial Position |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  | 3,413 |  | 3,413 |  |  |  | 2,588
Net property, plant, and equipment |  |  |  |  | 68,365 |  | 68,365 |  |  |  | 69,784
Total assets |  |  |  |  | 71,778 |  | 71,778 |  |  |  | 72,372
Current liabilities |  |  |  |  | 734 |  | 734 |  |  |  | 965
Owners’ equity – non-controlling interest |  |  |  |  | $ 71,044 |  | $ 71,044 |  |  |  | 71,407
Public Service Company of New Mexico [Member] | Valencia [Member] | Purchased Through May 30, 2028 [Member] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of megawatts purchased (in megawatts) | MW |  |  |  |  | 158 |  | 158 |  |  |  |
NM Capital [Member] | San Juan Generating Station [Member] | Coal Supply [Member] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan agreement among several entities |  | $ 125,000 |  |  |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  |  |  |  |  |  |  |  | $ 40,000
NM Capital [Member] | San Juan Coal Company, Westmoreland [Member] | Coal Supply [Member] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  |  | $ 40,000 |  | $ 40,000 |  |  |  |
Loan receivable |  |  |  |  | 125,000 |  | 125,000 |  |  |  |
Interest receivable |  |  |  |  | $ 1,600 |  | $ 1,600 |  |  |  |
Subsequent Event [Member] | NM Capital [Member] | San Juan Generating Station [Member] | Coal Supply [Member] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  |  |  |  |  |  |  | $ 30,300 |
Subsequent Event [Member] | NM Capital [Member] | San Juan Coal Company, Westmoreland [Member] | Coal Supply [Member] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  |  |  |  |  |  | $ 30,300 |  |
Loan receivable | $ 110,000 |  |  |  |  |  |  |  |  |  |
Principal payment and accrued interest received | $ (15,000) |  |  |  |  |  |  |  |  |  |

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