Condensed Consolidated Statement of Changes in Equity - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands	Total	Total PNMR Common Stockholders’ Equity [Member]	Common Stock [Member]	AOCI [Member]	Retained Earnings [Member]	Non-controlling Interest in Valencia [Member]	Public Service Company of New Mexico [Member]	Public Service Company of New Mexico [Member] Total PNMR Common Stockholders’ Equity [Member]	Public Service Company of New Mexico [Member] Common Stock [Member]	Public Service Company of New Mexico [Member] AOCI [Member]	Public Service Company of New Mexico [Member] Retained Earnings [Member]	Public Service Company of New Mexico [Member] Non-controlling Interest in Valencia [Member]	Texas-New Mexico Power Company [Member]	Texas-New Mexico Power Company [Member] Common Stock [Member]	Texas-New Mexico Power Company [Member] Paid-in Capital [Member]	Texas-New Mexico Power Company [Member] Retained Earnings [Member]
Beginning balance at Dec. 31, 2015	$ 1,726,220	$ 1,654,813	$ 1,166,465	$ (71,432)	$ 559,780	$ 71,407	$ 1,389,340	$ 1,317,933	$ 1,236,776	$ (71,476)	$ 152,633	$ 71,407
Beginning balance TNMP at Dec. 31, 2015	1,654,813						1,317,933						$ 533,380	$ 64	$ 404,166	$ 129,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from stock option exercise	3,275	3,275	3,275
Awards of common stock	(10,020)	(10,020)	(10,020)
Excess tax (shortfall) from stock-based payment arrangements	(15)	(15)	(15)
Stock based compensation expense	2,653	2,653	2,653
Valencia’s transactions with its owner	(3,999)					(3,999)	(3,999)					(3,999)
Net Earnings	13,965	10,678			10,678	3,287	7,561	4,274		0	4,274	$ 3,287
Net earnings	10,546						4,274						7,456			7,456
Subsidiary preferred stock dividends	(132)	(132)			(132)
Total other comprehensive income (loss)	(3,366)	(3,366)		(3,366)			(2,669)	(2,669)		(2,669)	0
Dividends declared on common stock	(17,524)	(17,524)			(17,524)
Dividends declared on preferred stock							(132)	(132)		0	(132)
Ending balance at Mar. 31, 2016	1,711,057	$ 1,640,362	$ 1,162,358	$ (74,798)	$ 552,802	$ 70,695	1,390,101	$ 1,319,406	$ 1,236,776	$ (74,145)	$ 156,775	$ 70,695
Ending balance TNMP at Mar. 31, 2016	$ 1,640,362						$ 1,319,406						$ 540,836	$ 64	$ 404,166	$ 136,606