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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Service billings [Member] | TNMP to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 0 | $ 2
Service billings [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 21,066 | 22,652
Service billings [Member] | PNMR to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 7,261 | 7,361
Service billings [Member] | PNM to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 109 | 108
Interest charges [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 53 | 1
Interest charges [Member] | PNMR to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 96 | 96
Interest charges [Member] | PNM to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 26 | 41
Income tax sharing payments [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 0
Income tax sharing payments [Member] | PNMR to TNMP [Member] |  |
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 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: 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 3: 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 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration