Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Earnings	$ 131,896	$ 31,078	$ 130,909
Net Earnings	116,849	15,640	116,254
Unrealized Gains on Available-for-Sale Securities:
Unrealized holding gains (losses) arising during the period, net of income tax (expense) benefit	474	6,688	10,661
Reclassification adjustment for (gains) included in net earnings (loss), net of income tax expense	(13,500)	(17,350)	(8,401)
Pension Liability Adjustment:
Experience gain (loss), net of income tax (expense) benefit	(11,282)	(2,679)	(9,258)
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, net of income tax (expense) benefit	3,356	3,620	3,120
Fair Value Adjustment for Cash Flow Hedges:
Change in fair market value, net of income tax (expense) benefit	(533)	44	(100)
Reclassification adjustment for (gains) losses included in net earnings (loss), net of income tax expense (benefit)	466	0	363
Total Other Comprehensive Income (Loss)	(21,019)	(9,677)	(3,615)
Comprehensive Income (Loss)	110,877	21,401	127,294
Comprehensive (Income) Attributable to Valencia Non-controlling Interest	(14,519)	(14,910)	(14,127)
Preferred Stock Dividend Requirements of Subsidiary	(528)	(528)	(528)
Comprehensive Income (Loss) Attributable to PNM	95,830	5,963	112,639
Public Service Company of New Mexico [Member]
Net Earnings	91,938	(324)	101,453
Net Earnings	77,419	(15,234)	87,326
Unrealized Gains on Available-for-Sale Securities:
Unrealized holding gains (losses) arising during the period, net of income tax (expense) benefit	474	6,688	10,661
Reclassification adjustment for (gains) included in net earnings (loss), net of income tax expense	(13,500)	(17,350)	(8,401)
Pension Liability Adjustment:
Experience gain (loss), net of income tax (expense) benefit	(11,282)	(2,679)	(9,258)
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, net of income tax (expense) benefit	3,356	3,620	3,120
Fair Value Adjustment for Cash Flow Hedges:
Total Other Comprehensive Income (Loss)	(20,952)	(9,721)	(3,878)
Comprehensive Income (Loss)	70,986	(10,045)	97,575
Comprehensive (Income) Attributable to Valencia Non-controlling Interest	(14,519)	(14,910)	(14,127)
Preferred Stock Dividend Requirements of Subsidiary	(528)	(528)	(528)
Comprehensive Income (Loss) Attributable to PNM	56,467	(24,955)	83,448
Texas-New Mexico Power Company [Member]
Net Earnings	41,672	41,963	37,807
Fair Value Adjustment for Cash Flow Hedges:
Change in fair market value, net of income tax (expense) benefit	0	0	(100)
Reclassification adjustment for (gains) losses included in net earnings (loss), net of income tax expense (benefit)	0	0	363
Total Other Comprehensive Income (Loss)	0	0	263
Comprehensive Income (Loss) Attributable to PNM	$ 41,672	$ 41,963	$ 38,070