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Electric Operating Revenue Change in Contract Liabilities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Beginning balance | $ 349
Consideration received in advance of service to be provided | 6,172
Deferred revenue earned | (6,172)
Ending balance | 349
Public Service Company of New Mexico |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Beginning balance | 349
Consideration received in advance of service to be provided | 4,660
Deferred revenue earned | (4,660)
Ending balance | 349
Texas-New Mexico Power Company |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Beginning balance | 0
Consideration received in advance of service to be provided | 1,512
Deferred revenue earned | (1,512)
Ending balance | $ 0

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