Financing - Long-term Debt Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-term Debt, by Maturity [Abstract]
2017	$ 274,025
2018	707,725
2019	184,612
2020	126,245
2021	310,272
Thereafter	785,698
Total	2,388,577	$ 2,086,370
PNMR [Member]
Long-term Debt, by Maturity [Abstract]
2017	42,025
2018	257,700
2019	12,310
2020	25,900
2021	4,272
Thereafter	0
Total	342,207	150,000
Public Service Company of New Mexico [Member]
Long-term Debt, by Maturity [Abstract]
2017	232,000
2018	450,025
2019	0
2020	100,345
2021	306,000
Thereafter	552,500
Total	1,640,870	1,590,870
Texas-New Mexico Power Company [Member]
Long-term Debt, by Maturity [Abstract]
2017	0
2018	0
2019	172,302
2020	0
2021	0
Thereafter	233,198
Total	$ 405,500	$ 345,500