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Variable Interest Entities (Details) |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) MW | May 30, 2014 | Oct. 08, 2013 USD ($) | Sep. 30, 2016 USD ($) MW | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) MW | Sep. 30, 2015 USD ($) | Nov. 01, 2016 USD ($) | Oct. 21, 2016 USD ($) | Aug. 31, 2016 USD ($) | Aug. 30, 2016 USD ($) | Aug. 01, 2016 USD ($) | Jul. 19, 2016 USD ($) | Jan. 15, 2016 lease MW | Dec. 31, 2015 USD ($) | Jan. 15, 2015 lease
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  |  |  | $ 4,006,000 | $ 3,678,000 | $ 11,037,000 | $ 10,909,000 |  |  |  |  |  |  |  |  |
Financial Position |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | 398,886,000 |  | 398,886,000 |  |  |  |  |  |  |  |  | $ 385,570,000 |
Total assets |  |  |  | 6,403,670,000 | 6,012,582,000 | 6,403,670,000 | 6,012,582,000 |  |  |  |  |  |  |  | 6,009,328,000 |
Current liabilities |  |  |  | 701,826,000 |  | 701,826,000 |  |  |  |  |  |  |  |  | 641,120,000 |
Owners’ equity – non-controlling interest |  |  |  | 70,117,000 |  | 70,117,000 |  |  |  |  |  |  |  |  | 71,407,000 |
Public Service Company of New Mexico [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  |  |  | 4,006,000 | 3,678,000 | 11,037,000 | 10,909,000 |  |  |  |  |  |  |  |  |
Financial Position |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | 310,645,000 |  | 310,645,000 |  |  |  |  |  |  |  |  | 357,757,000 |
Total assets |  |  |  | 4,799,012,000 |  | 4,799,012,000 |  |  |  |  |  |  |  |  | 4,599,344,000 |
Current liabilities |  |  |  | 275,983,000 |  | 275,983,000 |  |  |  |  |  |  |  |  | 316,921,000 |
Owners’ equity – non-controlling interest |  |  |  | 70,117,000 |  | 70,117,000 |  |  |  |  |  |  |  |  | 71,407,000 |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other financial obligations due to beneficial owner |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |
Recourse available for creditors of trusts other than contractual lease payments |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |
Additional rights to assets beyond use of leased assets |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |
Assets related to the trusts other than accrued lease payments |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  | 0 |
Liabilities related to the trusts other than accrued lease payments |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  | 0 |
Accrued lease payments |  |  |  | 3,800,000 |  | 3,800,000 |  |  |  |  |  |  |  |  | 18,400,000 |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of leases, expiring | lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4
Number of leases under which lease term was extended | lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of megawatts purchased (in megawatts) | MW | 64.1 |  |  |  |  |  |  |  |  |  |  |  |  | 64.1 |  |
Number of leases, expiring | lease |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Number of leases under which lease term was extended | lease |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of leases under which assets were purchased | lease |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Public Service Company of New Mexico [Member] | Valencia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for fixed costs |  |  |  | 4,900,000 | 4,900,000 | 14,500,000 | 14,500,000 |  |  |  |  |  |  |  |  |
Payment for variable costs |  |  |  | 500,000 | 300,000 | $ 1,100,000 | 900,000 |  |  |  |  |  |  |  |  |
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 |  |  | $ 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term contract option to purchase, approximate approval period |  |  |  |  |  | 15 months |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  | 5,356,000 | 5,182,000 | $ 15,541,000 | 15,337,000 |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  | (1,350,000) | (1,504,000) | (4,504,000) | (4,428,000) |  |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest |  |  |  | 4,006,000 | $ 3,678,000 | 11,037,000 | $ 10,909,000 |  |  |  |  |  |  |  |  |
Financial Position |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | 3,506,000 |  | 3,506,000 |  |  |  |  |  |  |  |  | 2,588,000 |
Net property, plant, and equipment |  |  |  | 67,656,000 |  | 67,656,000 |  |  |  |  |  |  |  |  | 69,784,000 |
Total assets |  |  |  | 71,162,000 |  | 71,162,000 |  |  |  |  |  |  |  |  | 72,372,000 |
Current liabilities |  |  |  | 1,045,000 |  | 1,045,000 |  |  |  |  |  |  |  |  | 965,000 |
Owners’ equity – non-controlling interest |  |  |  | $ 70,117,000 |  | $ 70,117,000 |  |  |  |  |  |  |  |  | 71,407,000 |
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 | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,300,000 |  | $ 40,000,000 |
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 |  |  |  |  |  |  |  |  |  | $ 30,300,000 | $ 40,000,000 |  |  |  |  |
Loan receivable | $ 125,000,000 |  |  | $ 110,000,000 |  | $ 110,000,000 |  |  |  |  |  |  |  |  |  |
Scheduled principal payment proceeds |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Interest receivable |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |
NM Capital [Member] | San Juan Coal Company, Westmoreland [Member] | Coal Supply [Member] | Subsequent event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled principal payment proceeds |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |
Scheduled interest payment proceeds |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |
Unaffiliated third party [Member] | San Juan Coal Company, Westmoreland [Member] | Coal Supply [Member] | Subsequent event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount held in a restricted bank account |  |  |  |  |  |  |  |  | $ 17,300,000 |  |  |  |  |  |  |

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