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Lease Commitments Lease Commitments (Tables) | 12 Months Ended
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Dec. 31, 2012
Leases [Abstract] |
Schedule of Rent Expense [Table Text Block] | Operating lease expense was:
| PNMR |  | PNM |  | TNMP
| (In thousands)
2012 | $ | 84,794 |  |  | $ | 78,483 |  |  | $ | 2,871 |
2011 | $ | 86,323 |  |  | $ | 78,422 |  |  | $ | 3,606 |
2010 | $ | 79,491 |  |  | $ | 71,209 |  |  | $ | 3,737 |
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | Future minimum operating lease payments at December 31, 2012 shown below have been reduced by PNM’s lease payments for amounts that will be returned to PNM on the lessor notes, which amounts vary but are approximately $39 million in 2013 and reduce thereafter to approximately $33 million annually in 2015:
| PNMR |  | PNM |  | TNMP
| (In thousands)
2013 | $ | 44,040 |  |  | $ | 40,217 |  |  | $ | 481 |
2014 | 52,136 |  |  | 49,079 |  |  | 55 |
2015 | 31,389 |  |  | 29,601 |  |  | — |
2016 | 15,790 |  |  | 15,790 |  |  | — |
2017 | 12,519 |  |  | 12,519 |  |  | — |
Later years | 94,883 |  |  | 94,883 |  |  | — |
| 250,757 |  |  | 242,089 |  |  | 536 |
Future payments under non-cancelable subleases | 233 |  |  | — |  |  | — |
Net minimum lease payments | $ | 250,524 |  |  | $ | 242,089 |  |  | $ | 536 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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