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Lease Commitments (Details) - Public Service Company of New Mexico [Member] $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) MW | Sep. 18, 2015 USD ($) MW | Apr. 01, 2015
Operating Leased Assets [Line Items] |  |  |  |
Public utilities, lease ownership percentage in EIP | 60.00% |  |  |
Public Utilities, Additional ownership percentage in EIP purchased |  |  |  | 40.00%
Public utilities, option to purchase leased capacity at fair value | $ 7.7 |  |  |
Palo Verde Nuclear Generating Station, Unit 2 Leases 31.2494 MW [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Purchase price of leased asset to be paid |  | $ 78.1 |  |
Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Leased capacity to be purchased (in megawatts) | MW |  |  | 32.76 |
Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016 [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Leased capacity to be purchased (in megawatts) | MW |  | 31.25 |  |
Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Purchase price of leased asset to be paid |  |  | $ 85.2 |

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