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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Services billings: | PNMR to PNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 23,679 | $ 24,402
Services billings: | PNMR to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 8,365 | 8,137
Services billings: | PNM to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 86 | 85
Services billings: | TNMP to PNMR |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 35 | 35
Services billings: | PNMR to NMRD |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 78 | 0
Renewable energy purchases: | PNM from NMRD |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 370 | 0
Interest billings: | PNMR to PNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 62 | 0
Interest billings: | PNMR to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 8 | 31
Interest billings: | PNM to PNMR |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 66 | 43
Income tax sharing payments: | PNMR to PNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 0
Income tax sharing payments: | PNMR to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 0
Income tax sharing payments: | TNMP to PNMR |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 0 | $ 0

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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