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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for uncollectible accounts | $ 1,189 | $ 1,081
Accumulated depreciation, nuclear fuel | $ 43,309 | $ 43,524
Cumulative preferred stock of subsidiary, stated value (in dollars per share) | $ 100 | $ 100
Cumulative preferred stock of subsidiary, shares authorized (in shares) | 10,000,000 | 10,000,000
Cumulative preferred stock of subsidiary, shares issued (in shares) | 115,293 | 115,293
Cumulative preferred stock of subsidiary, shares outstanding (in shares) | 115,293 | 115,293
Common stock, par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 120,000,000 | 120,000,000
Common stock, shares issued (in shares) | 79,653,624 | 79,653,624
Common stock, shares outstanding (in shares) | 79,653,624 | 79,653,624
PNM |  |
Allowance for uncollectible accounts | $ 1,189 | $ 1,081
Accumulated depreciation, nuclear fuel | $ 43,309 | $ 43,524
Cumulative preferred stock, stated value (in dollars per share) | $ 100 | $ 100
Cumulative preferred stock, shares authorized (in shares) | 10,000,000 | 10,000,000
Cumulative preferred stock, shares issued (in shares) | 115,293 | 115,293
Cumulative preferred stock, shares outstanding (in shares) | 115,293 | 115,293
Common stock, par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 40,000,000 | 40,000,000
Common stock, shares issued (in shares) | 39,117,799 | 39,117,799
Common stock, shares outstanding (in shares) | 39,117,799 | 39,117,799
Texas-New Mexico Power Company |  |
Common stock, par value (in dollars per share) | $ 10 | $ 10
Common stock, shares authorized (in shares) | 12,000,000 | 12,000,000
Common stock, shares issued (in shares) | 6,358 | 6,358
Common stock, shares outstanding (in shares) | 6,358 | 6,358

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