Lease Commitments - Schedule of Rent Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
PNMR [Member]
Operating lease expense [Line Items]
Operating lease expense	$ 51,938	$ 68,652	$ 82,756
Public Service Company of New Mexico [Member]
Operating lease expense [Line Items]
Operating lease expense	47,349	63,558	76,745
Texas-New Mexico Power Company [Member]
Operating lease expense [Line Items]
Operating lease expense	$ 3,748	$ 3,688	$ 3,932