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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Related Party Transaction [Line Items] |  |
Ownership percentage | 50.00% |
Services billings: | PNMR to PNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 26,826 | $ 23,679
Services billings: | PNMR to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 10,058 | 8,365
Services billings: | PNM to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 75 | 86
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 | 41 | 78
Renewable energy purchases: | PNM from NMRD |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 625 | 370
Interconnection billings: | PNM from NMRD |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 0
Interconnection billings: | PNM to PNMR |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 0
Interest billings: | PNMR to PNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 933 | 62
Interest billings: | PNMR to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 32 | 8
Interest billings: | PNM to PNMR |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 72 | 66
Income tax sharing payments: | PNMR to PNM |  |
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 The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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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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