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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | $ 305,374 | $ 387,663 |
Electric revenues from non-affiliates |  | 387,663 |
Intersegment revenues |  | 0 |
Total revenues |  | 387,663 |
Cost of energy | 91,847 | 158,507 |
Gross margin | 213,527 | 229,156 |
Other operating expenses | 121,384 | 138,463 |
Depreciation and amortization | 38,414 | 38,473 |
Operating income | 53,729 | 52,220 |
Interest income | 3,292 | 4,028 |
Other income (deductions) | 2,548 | 3,825 |
Net interest charges | (29,566) | (30,615) |
Earnings before Income Taxes | 30,003 | 29,458 |
Income taxes (benefit) | 9,526 | 9,506 |
Net Earnings | 20,477 | 19,952 |
Valencia non-controlling interest | (3,265) | (3,183) |
Subsidiary preferred stock dividends | (132) | (132) |
Net Earnings (Loss) Attributable to PNMR | 17,080 | 16,637 |
Total Assets | 5,197,896 | 5,213,726 | 5,204,613
Goodwill | 278,297 | 321,310 | 278,297
Additions to utility and non-utility plant included in accounts payable | 19,770 |  |
PNM Electric [Member] |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | 250,416 |  |
Electric revenues from non-affiliates |  | 234,238 |
Intersegment revenues |  | 0 |
Total revenues |  | 234,238 |
Cost of energy | 80,557 | 89,214 |
Gross margin | 169,859 | 145,024 |
Other operating expenses | 104,120 | 103,124 |
Depreciation and amortization | 23,634 | 23,735 |
Operating income | 42,105 | 18,165 |
Interest income | 3,335 | 4,057 |
Other income (deductions) | 4,982 | 5,217 |
Net interest charges | (18,493) | (18,080) |
Earnings before Income Taxes | 31,929 | 9,359 |
Income taxes (benefit) | 10,852 | 2,395 |
Net Earnings | 21,077 | 6,964 |
Valencia non-controlling interest | (3,265) | (3,183) |
Subsidiary preferred stock dividends | (132) | (132) |
Net Earnings (Loss) Attributable to PNMR | 17,680 | 3,649 |
Total Assets | 4,031,859 | 3,866,571 |
Goodwill | 51,632 | 51,632 |
Additions to utility and non-utility plant included in accounts payable | 18,296 |  |
TNMP Electric [Member] |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | 54,958 |  |
Electric revenues from non-affiliates |  | 45,028 |
Intersegment revenues |  | 8,814 |
Total revenues |  | 53,842 |
Cost of energy | 11,290 | 10,153 |
Gross margin | 43,668 | 43,689 |
Other operating expenses | 20,590 | 19,703 |
Depreciation and amortization | 11,287 | 10,262 |
Operating income | 11,791 | 13,724 |
Interest income | 0 | 0 |
Other income (deductions) | 105 | 316 |
Net interest charges | (7,097) | (7,299) |
Earnings before Income Taxes | 4,799 | 6,741 |
Income taxes (benefit) | 1,788 | 2,578 |
Net Earnings | 3,011 | 4,163 |
Valencia non-controlling interest | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 |
Net Earnings (Loss) Attributable to PNMR | 3,011 | 4,163 |
Total Assets | 1,037,616 | 1,011,252 |
Goodwill | 226,665 | 226,665 |
Additions to utility and non-utility plant included in accounts payable | 801 |  |
First Choice [Member] |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric revenues from non-affiliates |  | 108,450 |
Intersegment revenues |  | 0 |
Total revenues |  | 108,450 |
Cost of energy |  | 67,954 |
Gross margin |  | 40,496 |
Other operating expenses |  | 18,987 |
Depreciation and amortization |  | 280 |
Operating income |  | 21,229 |
Interest income |  | 4 |
Other income (deductions) |  | (106) |
Net interest charges |  | (146) |
Earnings before Income Taxes |  | 20,981 |
Income taxes (benefit) |  | 7,492 |
Net Earnings |  | 13,489 |
Valencia non-controlling interest |  | 0 |
Subsidiary preferred stock dividends |  | 0 |
Net Earnings (Loss) Attributable to PNMR |  | 13,489 |
Total Assets |  | 215,457 |
Goodwill |  | 43,013 |
Corporate and Other [Member] |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | 0 |  |
Electric revenues from non-affiliates |  | (53) |
Intersegment revenues |  | (8,814) |
Total revenues |  | (8,867) |
Cost of energy | 0 | (8,814) |
Gross margin | 0 | (53) |
Other operating expenses | (3,326) | (3,351) |
Depreciation and amortization | 3,493 | 4,196 |
Operating income | (167) | (898) |
Interest income | (43) | (33) |
Other income (deductions) | (2,539) | (1,602) |
Net interest charges | (3,976) | (5,090) |
Earnings before Income Taxes | (6,725) | (7,623) |
Income taxes (benefit) | (3,114) | (2,959) |
Net Earnings | (3,611) | (4,664) |
Valencia non-controlling interest | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 |
Net Earnings (Loss) Attributable to PNMR | (3,611) | (4,664) |
Total Assets | 128,421 | 120,446 |
Goodwill | 0 | 0 |
Additions to utility and non-utility plant included in accounts payable | $ 673 |  |

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