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Related Party Transactions (Tables) | 6 Months Ended
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Jun. 30, 2013
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | The table below summarizes the nature and amount of related party transactions of PNMR, PNM, and TNMP:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (In thousands)
Services billings: |  |  |  |  |  |  |
PNMR to PNM | $ | 20,837 |  |  | $ | 23,832 |  |  | 43,489 |  |  | 45,887 |
PNMR to TNMP | 6,856 |  |  | 6,816 |  |  | 14,217 |  |  | 13,767 |
PNM to TNMP | 133 |  |  | 168 |  |  | 241 |  |  | 289 |
TNMP to PNMR | 2 |  |  | 4 |  |  | 4 |  |  | 8 |
Interest billings: |  |  |  |  |  |  |
PNMR to TNMP | 119 |  |  | 32 |  |  | 215 |  |  | 50 |
PNMR to PNM | — |  |  | 1 |  |  | 1 |  |  | 1 |
PNM to PNMR | 37 |  |  | 44 |  |  | 78 |  |  | 89 |
Income tax sharing payments: |  |  |  |  |  |  |
PNMR to PNM | 45,000 |  |  | — |  |  | 45,000 |  |  | 63,114 |
PNMR to TNMP | — |  |  | — |  |  | — |  |  | 1,952 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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