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Significant Accounting Policies and Responsibility for Financial Statements Significant Accounting Policies and Responsibility for Financial Statements (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Dividends on Common Stock [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.185	$ 0.185	$ 0.165	$ 0.165	$ 0.555	$ 0.495
Dividends, Common Stock, Cash					$ 44,208
Public Service Company of New Mexico [Member]
Dividends on Common Stock [Line Items]
Dividends, Common Stock, Cash					30,300	68,000
Texas-New Mexico Power Company [Member]
Dividends on Common Stock [Line Items]
Dividends, Common Stock, Cash					$ 16,300	$ 3,700