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Schedule I - Condensed Financial Information of Parent Company (Statements of Earnings) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | $ 1,314,732 | $ 1,136,156 | $ 1,101,081
Operating income | $ (119,138) | $ 121,505 | $ 72,414 | $ 49,569 | $ 62,849 | $ 116,799 | $ 71,296 | $ 48,753 | 124,350 | 299,697 | 286,842
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | 26,833 | 12,048 | 10,572
Other (deductions) |  |  |  |  |  |  |  |  | (12,728) | (10,481) | (21,552)
Net other income and deductions |  |  |  |  |  |  |  |  | 36,663 | 20,577 | 9,675
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 46,153 | 200,647 | 175,069
Income Taxes |  |  |  |  |  |  |  |  | 15,075 | 69,738 | 59,513
Net Earnings Attributable to Company | $ (91,418) | $ 61,045 | $ 31,673 | $ 14,340 | $ 18,992 | $ 55,653 | $ 29,141 | $ 12,468 | 15,640 | 116,254 | 100,507
PNM Resources [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 1,221 | 650 | 941
Operating income |  |  |  |  |  |  |  |  | (1,221) | (650) | (941)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 27,352 | 124,543 | 116,634
Other income |  |  |  |  |  |  |  |  | 747 | 622 | 769
Other (deductions) |  |  |  |  |  |  |  |  | (8,275) | (13,650) | (22,825)
Net other income and deductions |  |  |  |  |  |  |  |  | 19,824 | 111,515 | 94,578
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 18,603 | 110,865 | 93,637
Income Taxes |  |  |  |  |  |  |  |  | 2,963 | (5,389) | (6,870)
Net Earnings Attributable to Company |  |  |  |  |  |  |  |  | $ 15,640 | $ 116,254 | $ 100,507

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