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Commitments and Contingencies - Coal Supply (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Other current assets | $ 71,482 | $ 58,471 |  |
Public Service Company of New Mexico [Member] | Surface [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Regulatory Assets | 100,000 |  |  |
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Public Utilities, Annual Funding |  | 1,000 | $ 300 | $ 3,500
Public Service Company of New Mexico [Member] | Mine Reclamation Trust [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Reclamation Trust Funding, Current fiscal year | 4,000 |  |  |
Reclamation Trust Funding, Next fiscal year | 5,000 |  |  |
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Surface [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual | 25,400 | 25,700 |  |
Final Reclamation, capped amount to be collected | 100,000 |  |  |
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Underground [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual | 9,100 | 8,600 |  |
San Juan Generating Station [Member] | Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Surface [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss | 56,500 |  |  |
San Juan Generating Station [Member] | Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Underground [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss | 93,300 |  |  |
San Juan Generating Station [Member] | Coal Supply [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |
Other current assets | $ 41,900 | $ 37,300 |  |
Public Utilities, Estimated Increase in Coal Cost, Percentage | 30.00% |  |  |

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