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Schedule I - Condensed Financial Information of Parent Company (Statements of Earnings) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | $ 1,101,081 | $ 1,068,682 | $ 1,443,320
Operating income | 40,532 | 117,739 | 77,867 | 50,704 | 36,736 | 118,150 | 65,106 | 53,729 | 286,842 | 273,721 | 257,299
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | 10,572 | 12,746 | 5,309
Other (deductions) |  |  |  |  |  |  |  |  | (21,552) | (17,636) | (24,715)
Net other income and deductions |  |  |  |  |  |  |  |  | 9,675 | 22,159 | 180,019
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 175,069 | 175,035 | 312,469
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 59,513 | 54,910 | 121,535
Net Earnings (Loss) Attributable to Company | 7,648 | 54,555 | 27,678 | 10,626 | 9,091 | 57,864 | 21,512 | 17,080 | 100,507 | 105,547 | 176,359
PNM Resources [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 941 | 3,287 | 20,547
Operating income |  |  |  |  |  |  |  |  | (941) | (3,287) | (20,547)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 116,634 | 117,900 | 205,215
Other income |  |  |  |  |  |  |  |  | 769 | 670 | 59
Other (deductions) |  |  |  |  |  |  |  |  | (22,825) | (20,904) | (34,124)
Net other income and deductions |  |  |  |  |  |  |  |  | 94,578 | 97,666 | 171,150
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 93,637 | 94,379 | 150,603
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (6,870) | (11,168) | (25,756)
Net Earnings (Loss) Attributable to Company |  |  |  |  |  |  |  |  | $ 100,507 | $ 105,547 | $ 176,359

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