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Fair Value of Derivative and Other Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value of Derivative and Other Financial Instruments [Line Items] |
Fair Value, by Balance Sheet Grouping [Table Text Block] | The carrying amounts and fair values of investments in PVNGS lessor notes, other investments, and long-term debt, which are not recorded at fair value on the Condensed Consolidated Balance Sheets are presented below:
|  |  |  |  | GAAP Fair Value Hierarchy
| Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
March 31, 2014 | (In thousands)
PNMR |  |  |  |  |  |  |  |  |
Long-term debt | $ | 1,845,338 |  |  | $ | 2,040,868 |  |  | $ | — |  |  | $ | 2,040,868 |  |  | $ | — |
Investment in PVNGS lessor notes | $ | 42,472 |  |  | $ | 44,871 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,871 |
Other investments | $ | 1,813 |  |  | $ | 2,529 |  |  | $ | 681 |  |  | $ | — |  |  | $ | 1,848 |
PNM |  |  |  |  |  |  |  |  |
Long-term debt | $ | 1,390,627 |  |  | $ | 1,515,097 |  |  | $ | — |  |  | $ | 1,515,097 |  |  | $ | — |
Investment in PVNGS lessor notes | $ | 42,472 |  |  | $ | 44,871 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,871 |
Other investments | $ | 436 |  |  | $ | 436 |  |  | $ | 436 |  |  | $ | — |  |  | $ | — |
TNMP |  |  |  |  |  |  |  |  |
Long-term debt | $ | 335,944 |  |  | $ | 396,195 |  |  | $ | — |  |  | $ | 396,195 |  |  | $ | — |
Other investments | $ | 245 |  |  | $ | 245 |  |  | $ | 245 |  |  | $ | — |  |  | $ | — |
December 31, 2013 |  |  |  |  |  |  |  |  |
PNMR |  |  |  |  |  |  |  |  |
Long-term debt | $ | 1,745,420 |  |  | $ | 1,905,230 |  |  | $ | — |  |  | $ | 1,905,230 |  |  | $ | — |
Investment in PVNGS lessor notes | $ | 52,958 |  |  | $ | 57,279 |  |  | $ | — |  |  | $ | — |  |  | $ | 57,279 |
Other investments | $ | 1,835 |  |  | $ | 3,196 |  |  | $ | 690 |  |  | $ | — |  |  | $ | 2,506 |
PNM |  |  |  |  |  |  |  |  |
Long-term debt | $ | 1,290,618 |  |  | $ | 1,382,938 |  |  | $ | — |  |  | $ | 1,382,938 |  |  | $ | — |
Investment in PVNGS lessor notes | $ | 52,958 |  |  | $ | 57,279 |  |  | $ | — |  |  | $ | — |  |  | $ | 57,279 |
Other investments | $ | 445 |  |  | $ | 445 |  |  | $ | 445 |  |  | $ | — |  |  | $ | — |
TNMP |  |  |  |  |  |  |  |  |
Long-term debt | $ | 336,036 |  |  | $ | 390,814 |  |  | $ | — |  |  | $ | 390,814 |  |  | $ | — |
Other investments | $ | 245 |  |  | $ | 245 |  |  | $ | 245 |  |  | $ | — |  |  | $ | — |
PNMR and PNM [Member] |
Fair Value of Derivative and Other Financial Instruments [Line Items] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | Commodity derivative instruments that are recorded at fair value, all of which are accounted for as economic hedges, are summarized as follows:
| Economic Hedges
| March 31, 2014 |  | December 31, 2013
PNMR and PNM | (In thousands)
Current assets | $ | 4,003 |  |  | $ | 4,064 |
Deferred charges | 2,474 |  |  | 3,002 |
| 6,477 |  |  | 7,066 |
Current liabilities | (5,446 | ) |  | (2,699 | )
Long-term liabilities | (907 | ) |  | (1,094 | )
| (6,353 | ) |  | (3,793 | )
Net | $ | 124 |  |  | $ | 3,273 |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] | The following table presents the effect of mark-to-market commodity derivative instruments on earnings, excluding income tax effects. Commodity derivatives had no impact on OCI for the periods presented.
| Economic Hedges
| Three Months Ended
| March 31,
| 2014 |  | 2013
PNMR and PNM | (In thousands)
Electric operating revenues | $ | (4,151 | ) |  | $ | (4,603 | )
Cost of energy | 189 |  |  | 756 |
Total gain (loss) | $ | (3,962 | ) |  | $ | (3,847 | )
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | Commodity contract volume positions are presented in MMBTU for gas related contracts and in MWh for power related contracts. The table below presents PNMR’s and PNM’s net buy (sell) volume positions:
| Economic Hedges
| MMBTU |  | MWh
March 31, 2014 |  |  |
PNMR and PNM | 775,000 |  |  | (3,287,548 | )
December 31, 2013 |  |  |
PNMR and PNM | 905,000 |  |  | (3,343,783 | )
Schedule of Collateral Related to Derivative [Table Text Block] | Net exposure is the net contractual liability for all contracts, including those designated as normal purchases and normal sales, offset by existing cash collateral and by any offsets available under master netting agreements, including both asset and liability positions.
Contingent Feature – Credit Rating Downgrade |  | Contractual Liability |  | Existing Cash Collateral |  | Net Exposure
|  | (In thousands)
March 31, 2014 |  |  |  |  |  |
PNMR and PNM |  | $ | 2,981 |  |  | $ | — |  |  | $ | 1,913 |
December 31, 2013 |  |  |  |  |  |
PNMR and PNM |  | $ | 2,398 |  |  | $ | — |  |  | $ | 2,152 |
Available-for-sale Securities [Table Text Block] | The proceeds and gross realized gains and losses on the disposition of available-for-sale securities for PNMR and PNM are shown in the following table. Realized gains and losses are determined by specific identification of costs of securities sold.
| Three Months Ended
| March 31,
| 2014 |  | 2013
| (In thousands)
Proceeds from sales | $ | 22,804 |  |  | $ | 14,284 |
Gross realized gains | $ | 3,119 |  |  | $ | 1,391 |
Gross realized (losses) | $ | (545 | ) |  | $ | (407 | )
The fair value and gross unrealized gains of investments in available-for-sale securities are presented in the following table. At March 31, 2014 and December 31, 2013, the fair value of available-for-sale securities included $225.8 million and $222.5 million for the NDT and $4.4 million and $4.4 million for the mine reclamation trust.
| March 31, 2014 |  | December 31, 2013
| Unrealized Gains |  | Fair Value |  | Unrealized Gains |  | Fair Value
PNMR and PNM |  |  | (In thousands) |  |
Cash and cash equivalents | $ | — |  |  | $ | 4,246 |  |  | $ | — |  |  | $ | 3,356 |
Equity securities: |  |  |  |  |  |  |
Domestic value | 14,558 |  |  | 41,055 |  |  | 14,523 |  |  | 39,460 |
Domestic growth | 23,002 |  |  | 74,517 |  |  | 25,656 |  |  | 76,292 |
International and other | 1,671 |  |  | 17,264 |  |  | 1,040 |  |  | 16,633 |
Fixed income securities: |  |  |  |  |  |  |
U.S. Government | 377 |  |  | 20,662 |  |  | 158 |  |  | 21,941 |
Municipals | 2,659 |  |  | 61,158 |  |  | 1,018 |  |  | 58,568 |
Corporate and other | 458 |  |  | 11,348 |  |  | 207 |  |  | 10,605 |
| $ | 42,725 |  |  | $ | 230,250 |  |  | $ | 42,602 |  |  | $ | 226,855 |
Investments Classified by Contractual Maturity Date [Table Text Block] | At March 31, 2014, the available-for-sale and held-to-maturity debt securities had the following final maturities:
| Fair Value
| Available-for-Sale |  | Held-to-Maturity
| PNMR and PNM |  | PNMR |  | PNM
| (In thousands)
Within 1 year | $ | 2,798 |  |  | $ | 11,968 |  |  | $ | 11,968 |
After 1 year through 5 years | 21,550 |  |  | 33,618 |  |  | 32,903 |
After 5 years through 10 years | 11,895 |  |  | — |  |  | — |
After 10 years through 15 years | 8,521 |  |  | — |  |  | — |
After 15 years through 20 years | 10,705 |  |  | — |  |  | — |
After 20 years | 37,699 |  |  | — |  |  | — |
| $ | 93,168 |  |  | $ | 45,586 |  |  | $ | 44,871 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] | Items recorded at fair value on the Condensed Consolidated Balance Sheets are presented below by level of the fair value hierarchy. There were no Level 3 fair value measurements at March 31, 2014 and December 31, 2013 for items recorded at fair value.
|  |  | GAAP Fair Value Hierarchy
| Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2)
March 31, 2014 | (In thousands)
PNMR and PNM |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Cash and cash equivalents | $ | 4,246 |  |  | $ | 4,246 |  |  | $ | — |
Equity securities: |  |  |  |  |
Domestic value | 41,055 |  |  | 41,055 |  |  | — |
Domestic growth | 74,517 |  |  | 74,517 |  |  | — |
International and other | 17,264 |  |  | 17,264 |  |  | — |
Fixed income securities: |  |  |  |  |
U.S. Government | 20,662 |  |  | 18,909 |  |  | 1,753 |
Municipals | 61,158 |  |  | — |  |  | 61,158 |
Corporate and other | 11,348 |  |  | 2,385 |  |  | 8,963 |
| $ | 230,250 |  |  | $ | 158,376 |  |  | $ | 71,874 |
Commodity derivative assets | $ | 6,477 |  |  | $ | — |  |  | $ | 6,477 |
Commodity derivative liabilities | (6,353 | ) |  | — |  |  | (6,353 | )
Net | $ | 124 |  |  | $ | — |  |  | $ | 124 |
December 31, 2013 |  |  |  |  |
PNMR and PNM |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Cash and cash equivalents | $ | 3,356 |  |  | $ | 3,356 |  |  | $ | — |
Equity securities: |  |  |  |  |
Domestic value | 39,460 |  |  | 39,460 |  |  | — |
Domestic growth | 76,292 |  |  | 76,292 |  |  | — |
International and other | 16,633 |  |  | 16,633 |  |  | — |
Fixed income securities: |  |  |  |  |
U.S. Government | 21,941 |  |  | 20,194 |  |  | 1,747 |
Municipals | 58,568 |  |  | — |  |  | 58,568 |
Corporate and other | 10,605 |  |  | 2,245 |  |  | 8,360 |
| $ | 226,855 |  |  | $ | 158,180 |  |  | $ | 68,675 |
Commodity derivative assets | $ | 7,066 |  |  | $ | — |  |  | $ | 7,066 |
Commodity derivative liabilities | (3,793 | ) |  | — |  |  | (3,793 | )
Net | $ | 3,273 |  |  | $ | — |  |  | $ | 3,273 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL7498348-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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