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Schedule I - Condensed Financial Information of Parent Company (Statement of Cash flow) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash Flows From Operating Activities: |  |  |
Net earnings (loss) | $ 105,547 | $ 176,359 | $ (45,215)
Depreciation and amortization | 206,499 | 195,366 | 186,067
Deferred income tax expense | 56,243 | 124,424 | 35,674
Equity in net (earnings) loss of Optim Energy | 0 | 0 | 15,223
Impairment of equity investment in Optim Energy | 0 | 0 | (188,176)
(Gain) on reacquired debt | 0 | 9,209 | 0
Stock based compensation expense | 3,585 | 6,556 | 2,894
Changes in certain assets and liabilities: |  |  |
Other current assets | (2,598) | (21,979) | (42,841)
Other assets | (30,778) | (15,835) | 8,559
Accounts payable | 14,020 | 20,969 | (15,462)
Accrued interest and taxes | 255 | 7,304 | 34,163
Other current liabilities | (19,905) | 3,460 | (35,974)
Other liabilities | (70,743) | (6,735) | (36,750)
Net cash flows from operating activities | 281,349 | 292,240 | 287,352
Cash Flows From Investing Activities: |  |  |
Utility plant additions | (308,909) | (326,931) | (281,488)
Investments in Optim Energy | 0 | 0 | (20,279)
Other, net | 1,353 | (17) | 2,004
Net cash flows from investing activities | (285,895) | 19,778 | (275,906)
Cash Flows From Financing Activities: |  |  |
Short-term borrowings (repayments), net | (24,000) | (139,300) | 24,000
Repayment of long-term debt | (22,387) | (110,752) | (405,970)
Purchase of preferred stock | 0 | (73,475) | 0
Purchase of common stock | 0 | (125,683) | 0
Proceeds from stock option exercise | 11,684 | 5,622 | 1,247
Purchases to satisfy awards of common stock | (25,168) | (10,104) | (2,986)
Excess tax (shortfall) from stock-based payment arrangements | 0 | 0 | (580)
Dividends paid | (45,137) | (45,656) | (46,254)
Net cash flows from financing activities | (1,560) | (312,331) | (10,683)
Change in Cash and Cash Equivalents | (6,106) | (313) | 763
Cash and Cash Equivalents at Beginning of Year | 15,091 | 15,404 | 14,641
Cash and Cash Equivalents at End of Year | 8,985 | 15,091 | 15,404
Supplemental Cash Flow Disclosures: |  |  |
Interest paid | 113,265 | 116,391 | 119,676
Income taxes paid (refunded), net | 5,302 | (5,527) | (99,318)
PNM Resources [Member] |  |  |
Cash Flows From Operating Activities: |  |  |
Net earnings (loss) | 105,547 | 176,359 | (45,215)
Depreciation and amortization | 5,000 | 7,654 | 6,767
Deferred income tax expense | (46,632) | (34,396) | (73,067)
Equity in (earnings) loss of subsidiaries | (117,900) | (205,215) | (96,804)
Equity in net (earnings) loss of Optim Energy | 0 | 0 | 15,223
Impairment of equity investment in Optim Energy | 0 | 0 | (188,176)
(Gain) on reacquired debt | 0 | 9,209 | 0
Stock based compensation expense | 3,585 | 6,556 | 2,894
Changes in certain assets and liabilities: |  |  |
Other current assets | (43,638) | 42,687 | 15,171
Other assets | 34,096 | 59,975 | 31
Accounts payable | 8 | (1) | (157)
Accrued interest and taxes | (28,855) | 27,348 | 141
Other current liabilities | 3,876 | 4,765 | (8,955)
Other liabilities | (29,601) | (12,854) | 18,236
Net cash flows from operating activities | (114,514) | 82,087 | 22,441
Cash Flows From Investing Activities: |  |  |
Utility plant additions | (7,524) | 0 | 0
Investments in subsidiaries | 0 | (43,000) | 0
Investments in Optim Energy | 0 | 0 | (20,279)
Cash dividends from subsidiaries | 61,406 | 285,757 | 47,940
Net cash flows from investing activities | 53,882 | 242,757 | 27,661
Cash Flows From Financing Activities: |  |  |
Short-term borrowings (repayments), net | 120,900 | (15,300) | (8,000)
Short-term borrowings (repayments) – affiliate, net | 0 | 300 | 1,719
Repayment of long-term debt | (2,387) | (60,391) | (2,125)
Purchase of preferred stock | 0 | (73,475) | 0
Purchase of common stock | 0 | (125,683) | 0
Proceeds from stock option exercise | 11,684 | 5,622 | 1,247
Purchases to satisfy awards of common stock | (25,168) | (10,104) | (2,986)
Excess tax (shortfall) from stock-based payment arrangements | 0 | 0 | (580)
Dividends paid | (44,609) | (45,128) | (45,726)
Other, net | 0 | (747) | 0
Net cash flows from financing activities | 60,420 | (324,906) | (56,451)
Change in Cash and Cash Equivalents | (212) | (62) | (6,349)
Cash and Cash Equivalents at Beginning of Year | 241 | 303 | 6,652
Cash and Cash Equivalents at End of Year | 29 | 241 | 303
Supplemental Cash Flow Disclosures: |  |  |
Interest paid | 15,007 | 19,215 | 19,078
Income taxes paid (refunded), net | $ 1,501 | $ 5,454 | $ (27,018)

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