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Earnings and Dividends Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Earnings Per Share [Abstract]
Earnings Attributable to PNMR	$ 18,992us-gaap_NetIncomeLoss	$ 55,653us-gaap_NetIncomeLoss	$ 29,141us-gaap_NetIncomeLoss	$ 12,468us-gaap_NetIncomeLoss	$ 7,648us-gaap_NetIncomeLoss	$ 54,555us-gaap_NetIncomeLoss	$ 27,678us-gaap_NetIncomeLoss	$ 10,626us-gaap_NetIncomeLoss	$ 116,254us-gaap_NetIncomeLoss		$ 100,507us-gaap_NetIncomeLoss		$ 105,547us-gaap_NetIncomeLoss
Average Number of Common Shares:
Outstanding during year									79,654,000us-gaap_WeightedAverageNumberOfSharesIssuedBasic		79,654,000us-gaap_WeightedAverageNumberOfSharesIssuedBasic		79,654,000us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Vested awards of restricted stock									134,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock		191,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock		145,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Average Shares – Basic									79,788,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		79,845,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		79,799,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock									491,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	[1]	586,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	[1]	618,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	[1]
Average Shares – Diluted									80,279,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	[1]	80,431,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	[1]	80,417,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	[1]
Net Earnings Per Share of Common Stock:
Basic (dollars per share)	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.70us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic	$ 1.46us-gaap_EarningsPerShareBasic		$ 1.26us-gaap_EarningsPerShareBasic		$ 1.32us-gaap_EarningsPerShareBasic
Diluted (dollars per share)	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted	$ 1.45us-gaap_EarningsPerShareDiluted		$ 1.25us-gaap_EarningsPerShareDiluted		$ 1.31us-gaap_EarningsPerShareDiluted
Common Stock, Dividends, Per Share, Declared									$ 0.755us-gaap_CommonStockDividendsPerShareDeclared		$ 0.68us-gaap_CommonStockDividendsPerShareDeclared		$ 0.58us-gaap_CommonStockDividendsPerShareDeclared
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)									254,050us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] Excludes out-of-the-money options for 254,050 shares of common stock at December 31, 2014. See Note 13.

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