Lease Commitments Schedule of Future Minimum Rental Payments for Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
PNMR [Member]
Lease commitments
2014	$ 53,594
2015	40,952
2016	33,788
2017	30,942
2018	30,948
Later years	167,225
Operating Leases, Future Minimum Payments Due	357,449
Future payments under non-cancelable subleases	93
Operating Leases, Future Minimum Payments Due, Net	357,356
Public Service Company of New Mexico [Member]
Lease commitments
2014	49,580
2015	38,290
2016	33,363
2017	30,749
2018	30,749
Later years	166,830
Operating Leases, Future Minimum Payments Due	349,561
Future payments under non-cancelable subleases	0
Operating Leases, Future Minimum Payments Due, Net	349,561
Texas-New Mexico Power Company [Member]
Lease commitments
2014	815
2015	676
2016	237
2017	0
2018	0
Later years	0
Operating Leases, Future Minimum Payments Due	1,728
Future payments under non-cancelable subleases	0
Operating Leases, Future Minimum Payments Due, Net	$ 1,728