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Lease Commitments (Details) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) MW | Jan. 14, 2016 USD ($) | Jun. 01, 2014 USD ($) | May. 01, 2014 MW
Public Service Company of New Mexico [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Public Utilities, Option to Purchase Leased Capacity At Fair Value | $ 7.7 |  |  |
Public Service Company of New Mexico [Member] | TGP Granada, LLC and its affiliate Complaint [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Public Utilities, Lease ownership percentage in EIP | 60.00% |  |  |
Public Service Company of New Mexico [Member] | 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 |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Leased Capacity to be Purchased | MW |  |  |  | 32.76
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016 [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Leased Capacity to be Purchased | MW | 31.25 |  |  |
Public Service Company of New Mexico [Member] | 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 |  |  |
Early Purchase Price of Leased Asset, Period 1 |  |  | $ 79.9 |
Early Purchase Price of Leased Asset | 83.4 |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Maximum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Additional consideration for early purchase of leased asset, Period 1 |  |  | $ 5.8 |
Additional consideration for early purchase of leased asset, Period 2 | $ 2.8 |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Subsequent Event [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Purchase Price of Leased Asset, Period 3 |  | $ 85.2 |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Additional consideration for early purchase of leased asset effective June 1, 2014 |  | $ 1.2 |  |
Tortoise Capital Resources Corporation [Member] | TGP Granada, LLC and its affiliate Complaint [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Public Utilities, Lease ownership percentage in EIP | 40.00% |  |  |

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