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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, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash Flows From Operating Activities:      
Net earnings (loss) $ 190,934 $ (31,124) $ 136,734
Depreciation and amortization 195,366 186,067 173,446
Deferred income tax expense 124,424 35,674 27,727
Equity in net (earnings) loss of Optim Energy 0 15,223 30,145
Impairment of equity investment in Optim Energy 0 (188,176) 0
Loss Gain on reacquired debt 9,209 0 (7,317)
Stock based compensation expense 6,556 2,894 2,188
Changes in certain assets and liabilities:      
Other current assets (21,979) (42,841) 47,559
Other assets (15,835) 8,559 725
Accounts payable 20,969 (15,462) (70,540)
Accrued interest and taxes 7,304 34,163 (94,996)
Other current liabilities 3,460 (35,974) (20,980)
Other liabilities (6,735) (36,750) (14,195)
Net cash flows from operating activities 292,240 287,352 87,706
Cash Flows From Investing Activities:      
Investments in Optim Energy 0 (20,279) 0
Other, net (17) 2,004 4,697
Net cash flows from investing activities 19,778 (275,906) 379,726
Cash Flows From Financing Activities:      
Short-term borrowings (repayments), net (139,300) 24,000 (546,667)
Repayment of long-term debt (110,752) (405,970) (352,084)
Purchase of preferred stock (73,475) 0 0
Purchases of common stock (125,683) 0 0
Issuance of common stock 0 0 1,245
Proceeds from stock option exercise 5,622 1,247 0
Purchases to satisfy awards of common stock (10,104) (2,986) (951)
Excess tax (shortfall) from stock-based payment arrangements 0 (580) (760)
Dividends paid (45,656) (46,254) (46,229)
Net cash flows from financing activities (312,331) (10,683) (593,435)
Change in Cash and Cash Equivalents (313) 763 (126,003)
Cash and Cash Equivalents at Beginning of Year 15,404 14,641 140,644
Cash and Cash Equivalents at End of Year 15,091 15,404 14,641
Supplemental Cash Flow Disclosures:      
Interest paid 116,391 119,676 118,798
Income taxes paid (refunded), net (5,527) (99,318) 118,160
PNMR [Member]
      
Cash Flows From Operating Activities:      
Net earnings (loss) 176,359 (45,215) 124,316
Depreciation and amortization 7,654 6,767 4,893
Deferred income tax expense (34,396) (73,067) (16,957)
Equity in (earnings) loss of subsidiaries (205,215) (96,804) (147,293)
Equity in net (earnings) loss of Optim Energy 0 15,223 30,145
Impairment of equity investment in Optim Energy 0 (188,176) 0
Loss Gain on reacquired debt 9,209 0 (7,317)
Stock based compensation expense 6,556 2,894 2,188
Changes in certain assets and liabilities:      
Other current assets 42,687 15,171 8,391
Other assets 59,975 31 634
Accounts payable (1) (157) (97)
Accrued interest and taxes 27,348 141 (1,080)
Other current liabilities 4,765 (8,955) 1,387
Other liabilities (12,854) 18,236 (22,359)
Net cash flows from operating activities 82,087 22,441 (23,149)
Cash Flows From Investing Activities:      
Investments in subsidiaries (43,000) 0 (86,253)
Investments in Optim Energy 0 (20,279) 0
Cash dividends paid to parent company by consolidated subsidiaries 285,757 47,940 347,012
Other, net 0 0 3
Net cash flows from investing activities 242,757 27,661 260,762
Cash Flows From Financing Activities:      
Short-term borrowings (repayments), net (15,300) (8,000) (114,667)
Short-term borrowings (repayments), net – affiliate 300 1,719 3,200
Repayment of long-term debt (60,391) (2,125) (148,422)
Purchase of preferred stock (73,475) 0 0
Purchases of common stock (125,683) 0 0
Issuance of common stock 0 0 1,245
Proceeds from stock option exercise 5,622 1,247 0
Purchases to satisfy awards of common stock (10,104) (2,986) (951)
Excess tax (shortfall) from stock-based payment arrangements 0 (580) (760)
Dividends paid (45,128) (45,726) (45,701)
Other, net (747) 0 0
Net cash flows from financing activities (324,906) (56,451) (306,056)
Change in Cash and Cash Equivalents (62) (6,349) (68,443)
Cash and Cash Equivalents at Beginning of Year 303 6,652 75,095
Cash and Cash Equivalents at End of Year 241 303 6,652
Supplemental Cash Flow Disclosures:      
Interest paid 19,215 19,078 32,092
Income taxes paid (refunded), net $ 5,454 $ (27,018) $ 116,593