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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Allowance for uncollectible accounts | $ 1,339 | $ 1,751
Accumulated depreciation, non-utility property | 139 | 131
Accumulated depreciation, nuclear fuel | 45,793 | 42,644
Cumulative preferred stock of subsidiary, stated value | $ 100 | $ 100
Cumulative preferred stock of subsidiary, shares authorized | 10,000,000 | 10,000,000
Cumulative preferred stock of subsidiary, shares issued | 115,293 | 115,293
Cumulative preferred stock of subsidiary, shares authorized | 115,293 | 115,293
Common stock, par value | $ 0 | $ 0
Common stock, shares authorized | 120,000,000 | 120,000,000
Common stock, shares issued | 79,653,624 | 79,653,624
Common stock, shares outstanding | 79,653,624 | 79,653,624
Public Service Company of New Mexico [Member] |  |
Allowance for uncollectible accounts | 1,339 | 1,751
Accumulated depreciation, nuclear fuel | $ 45,793 | $ 42,644
Cumulative preferred stock, stated value | $ 100 | $ 100
Cumulative preferred stock, shares authorized | 10,000,000 | 10,000,000
Cumulative preferred stock, shares issued | 115,293 | 115,293
Cumulative preferred stock, shares outstanding | 115,293 | 115,293
Common stock, par value | $ 0 | $ 0
Common stock, shares authorized | 40,000,000 | 40,000,000
Common stock, shares issued | 39,117,799 | 39,117,799
Common stock, shares outstanding | 39,117,799 | 39,117,799
Texas-New Mexico Power Company [Member] |  |
Common stock, par value | $ 10 | $ 10
Common stock, shares authorized | 12,000,000 | 12,000,000
Common stock, shares issued | 6,358 | 6,358
Common stock, shares outstanding | 6,358 | 6,358

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