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Lease Commitments - Schedule of Rent Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
PNMR      
Operating lease expense [Line Items]      
Operating lease expense $ 35,972 $ 37,432 $ 61,088
Public Service Company of New Mexico      
Operating lease expense [Line Items]      
Operating lease expense 31,817 32,843 55,994
Texas-New Mexico Power Company      
Operating lease expense [Line Items]      
Operating lease expense $ 3,570 $ 3,748 $ 3,688