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Summary of the Business and Significant Accounting Policies (Inventories/Depreciation and Amortization) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | $ 67,223 | $ 59,643 |
Coal [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | 24,872 | 19,231 |
Materials and supplies [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | 42,351 | 40,412 |
Public Service Company of New Mexico [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | 64,520 | 56,790 |
Public Service Company of New Mexico [Member] | Coal [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | 24,872 | 19,231 |
Public Service Company of New Mexico [Member] | Materials and supplies [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | 39,648 | 37,559 |
Public Service Company of New Mexico [Member] | Electric plant [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Depreciation average rates used (as a percent) | 2.27% | 2.25% | 2.24%
Public Service Company of New Mexico [Member] | Common, intangible, and general plant [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Depreciation average rates used (as a percent) | 4.87% | 5.35% | 6.03%
Texas-New Mexico Power Company [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | 2,703 | 2,853 |
Depreciation average rates used (as a percent) | 3.66% | 3.56% | 3.41%
Texas-New Mexico Power Company [Member] | Coal [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | 0 | 0 |
Texas-New Mexico Power Company [Member] | Materials and supplies [Member] |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory, Net | $ 2,703 | $ 2,853 |

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Composite depreciation rate for public utility plants in service. + References No definition available. + Details
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