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Regulatory Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Regulatory Assets |  |
Regulatory Assets, Current | $ 24,416 | $ 39,120
Regulatory Assets, Noncurrent | 523,955 | 555,577
Regulatory Liabilities |  |
Regulatory Liability, Current | (1,081) | (15,173)
Regulatory liabilities, Noncurrent | (460,649) | (423,460)
Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Current | 19,394 | 36,490
Regulatory Assets, Noncurrent | 384,217 | 431,956
Regulatory Assets | 403,611 | 468,446
Regulatory Liabilities |  |
Regulatory Liability, Current | (1,081) | (15,172)
Regulatory liabilities, Noncurrent | (414,611) | (379,841)
Regulatory Liabilities | (415,692) | (395,013)
Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Current | 5,022 | 2,630
Regulatory Assets, Noncurrent | 139,738 | 123,621
Regulatory Assets | 144,760 | 126,251
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (46,038) | (43,619)
Deferred income taxes Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (80,495) | (49,723)
Deferred income taxes Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (4,563) | (5,203)
Advanced Metering Infrastructure Costs [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | 7,251 | 6,386
Other [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Liabilities |  |
Regulatory Liability, Current | (1,081) | (15,172)
Removal Costs [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (266,075) | (257,396)
Removal Costs [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (30,863) | (31,115)
Asset retirement obligations [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (37,567) | (39,280)
Renewable energy costs [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (26,011) | (26,988)
Other [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (4,463) | (6,454)
Other [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Liabilities |  |
Regulatory liabilities, Noncurrent | (3,361) | (915)
Regulatory Assets, Transmission Cost Recovery | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Current | 4,250 | 2,287
Regulatory Assets, Other Current [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Current | 0 | 224
Stranded costs [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 63,606 | 71,240
Environmental Restoration Costs [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 40,144 | 46,065
Deferred income taxes Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 61,850 | 54,781
Deferred income taxes Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 10,868 | 11,179
Pension and Other Postretirement Plans Costs [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 206,691 | 254,351
Pension and Other Postretirement Plans Costs [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 19,938 | 28,307
Loss on reacquired debt [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 27,490 | 29,702
Loss on reacquired debt [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 38,616 | 1,711
Fuel and purchased power adjustment clause [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Current | 49,100 |
Fuel and purchased power adjustment clause [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Current | 19,394 | 36,266
Regulatory Assets, Noncurrent | 25,386 | 18,619
Renewable energy costs [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 13,311 | 18,768
Hurricane recovery costs [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 0 | 4,572
Advanced Metering Infrastructure Costs [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 5,083 | 3,538
Other [Member] | Public Service Company of New Mexico [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Noncurrent | 9,345 | 9,670
Other [Member] | Texas-New Mexico Power Company [Member] |  |
Regulatory Assets |  |
Regulatory Assets, Current | 772 | 343
Regulatory Assets, Noncurrent | $ 1,627 | $ 3,074

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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