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Related Party Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |
Ownership percentage | 50.00% |  |
Services billings: | PNMR to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | $ 96,327 | $ 95,637 | $ 97,914
Services billings: | PNMR to TNMP |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 36,554 | 33,493 | 31,095
Services billings: | PNM to TNMP |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 375 | 367 | 382
Services billings: | TNMP to PNMR |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 141 | 140 | 141
Services billings: | TNMP to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 0 | 0 | 154
Services billings: | PNMR to NMRD |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 238 | 183 | 0
Renewable energy purchases: | PNM from NMRD |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 3,124 | 2,924 | 0
Interconnection and facility study billings: | PNMR to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 68,820 | 0 | 0
Interconnection and facility study billings: | PNM to NMRD |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 650 | 2,108 | 0
Interconnection and facility study billings: | PNM to PNMR |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 0 | 68,820 | 0
Interest billings: | PNMR to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 3,365 | 2,585 | 21
Interest billings: | PNMR to TNMP |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 42 | 136 | 133
Interest billings: | PNM to PNMR |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 299 | 289 | 220
Income tax sharing payments: | PNMR to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 0 | 0 | 23,391
Income tax sharing payments: | PNMR to TNMP |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 0 | 0 | 0
Income tax sharing payments: | TNMP to PNMR |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 12,996 | 3,424 | 20,686
Income tax sharing payments: | PNM to PNMR |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | $ 0 | $ 134 | $ 0

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