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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | $ 1,084,966 | $ 1,314,732 | $ 1,136,156
Operating income | $ 63,584 | $ 108,071 | $ 64,822 | $ 41,508 | $ (119,138) | $ 121,505 | $ 72,414 | $ 49,569 | 277,985 | 124,350 | 299,697
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | 17,796 | 26,833 | 12,048
Net other income and deductions |  |  |  |  |  |  |  |  | 45,822 | 36,663 | 20,577
Interest Charges |  |  |  |  |  |  |  |  | 128,633 | 114,860 | 119,627
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 195,174 | 46,153 | 200,647
Income Taxes |  |  |  |  |  |  |  |  | 63,278 | 15,075 | 69,738
Net Earnings Attributable to Company | $ 24,809 | $ 54,418 | $ 27,076 | $ 10,546 | $ (91,418) | $ 61,045 | $ 31,673 | $ 14,340 | 116,849 | 15,640 | 116,254
PNM Resources [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 2,871 | 1,221 | 650
Operating income |  |  |  |  |  |  |  |  | (2,871) | (1,221) | (650)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 122,252 | 27,352 | 124,543
Other income |  |  |  |  |  |  |  |  | 1,711 | 747 | 622
Net other income and deductions |  |  |  |  |  |  |  |  | 123,963 | 28,099 | 125,165
Interest Charges |  |  |  |  |  |  |  |  | 8,102 | 8,275 | 13,650
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 112,990 | 18,603 | 110,865
Income Taxes |  |  |  |  |  |  |  |  | (3,859) | 2,963 | (5,389)
Net Earnings Attributable to Company |  |  |  |  |  |  |  |  | $ 116,849 | $ 15,640 | $ 116,254

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