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Pension and Other Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 2011
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefit Plans | Pension and Other Postretirement Benefit Plans PNMR and its subsidiaries maintain qualified defined benefit pension plans, postretirement benefit plans providing medical and dental benefits, and executive retirement programs (“PNM Plans” and “TNMP Plans”). PNMR maintains the legal obligation for the benefits owed to participants under these plans. Information concerning pension and other postretirement plans is contained in Note 12 of Notes to Consolidated Financial Statements in the 2010 Annual Reports on Form 10-K. Annual net periodic benefit cost (income) for the plans is actuarially determined using the methods and assumptions set forth in that note and is recognized ratably throughout the year. PNM Plans The following table presents the components of the PNM Plans’ net periodic benefit cost:
| Three Months Ended September 30,
| Pension Plan |  | Other Postretirement Benefits |  | Executive Retirement Program
| 2011 |  | 2010 |  | 2011 |  | 2010 |  | 2011 |  | 2010
| (In thousands)
Components of Net Periodic |  |  |  |  |  |  |  |  |  |  |
Benefit Cost |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 65 |  |  | $ | 105 |  |  | $ | — |  |  | $ | — |
Interest cost | 8,202 |  |  | 8,518 |  |  | 1,345 |  |  | 1,913 |  |  | 233 |  |  | 263 |
Long-term return on plan assets | (9,269 | ) |  | (9,339 | ) |  | (1,347 | ) |  | (1,393 | ) |  | — |  |  | — |
Amortization of net loss | 2,302 |  |  | 1,613 |  |  | 801 |  |  | 1,372 |  |  | 23 |  |  | 18 |
Amortization of prior service cost | 79 |  |  | 79 |  |  | (662 | ) |  | (1,036 | ) |  | — |  |  | — |
Net periodic benefit cost | $ | 1,314 |  |  | $ | 871 |  |  | $ | 202 |  |  | $ | 961 |  |  | $ | 256 |  |  | $ | 281 |
| Nine Months Ended September 30,
| Pension Plan |  | Other Postretirement Benefits |  | Executive Retirement Program
| 2011 |  | 2010 |  | 2011 |  | 2010 |  | 2011 |  | 2010
|  |  |  |  | (In thousands) |  |  |  |
Components of Net Periodic |  |  |  |  |  |  |  |  |  |  |
Benefit Cost |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 195 |  |  | $ | 314 |  |  | $ | — |  |  | $ | — |
Interest cost | 24,606 |  |  | 25,555 |  |  | 4,035 |  |  | 5,738 |  |  | 699 |  |  | 790 |
Long-term return on plan assets | (27,807 | ) |  | (28,016 | ) |  | (4,041 | ) |  | (4,179 | ) |  | — |  |  | — |
Amortization of net loss | 6,906 |  |  | 4,838 |  |  | 2,403 |  |  | 4,116 |  |  | 69 |  |  | 53 |
Amortization of prior service cost | 237 |  |  | 238 |  |  | (1,986 | ) |  | (3,107 | ) |  | — |  |  | — |
Net periodic benefit cost | $ | 3,942 |  |  | $ | 2,615 |  |  | $ | 606 |  |  | $ | 2,882 |  |  | $ | 768 |  |  | $ | 843 |
PNM made contributions to its pension plan trust of $20.5 million and $34.0 million in the three months and nine months ended September 30, 2011 and $6.5 million and $13.1 million in the three months and nine months ended September 30, 2010. PNM anticipates making additional contributions of $7.5 million in 2011. Based on current law and estimates of portfolio performance, PNM estimates making contributions to its pension plan trust that total $163.9 million for 2012- 2015. The estimated contributions were developed using estimated discount rates and expected returns on assets to calculate the pension liabilities. Actual amounts to be funded in the future will be dependent on the actuarial assumptions at that time, including the appropriate discount rate and return on assets. PNM contributed $0.7 million and $1.9 million to the trust for other postretirement benefits for the three months and nine months ended September 30, 2011 and $0.4 million and $1.6 million for the three months and nine months ended September 30, 2010. PNM expects contributions during 2011 to the trust for other postretirement benefits to total $2.6 million. Disbursements under the executive retirement program, which are funded by the Company and considered to be contributions to the plan, were $0.4 million and $1.2 million in the three months and nine months ended September 30, 2011 and $0.4 million and $1.1 million in the three months and nine months ended September 30, 2010 and are expected to total $1.5 million during 2011. TNMP Plans The following table presents the components of the TNMP Plans’ net periodic benefit cost (income):
| Three Months Ended September 30,
| Pension Plan |  | Other Postretirement Benefits |  | Executive Retirement Program
| 2011 |  | 2010 |  | 2011 |  | 2010 |  | 2011 |  | 2010
|  |  |  |  | (In thousands) |  |  |  |
Components of Net Periodic |  |  |  |  |  |  |  |  |  |  |
Benefit Cost (Income) |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 77 |  |  | $ | 72 |  |  | $ | — |  |  | $ | — |
Interest cost | 951 |  |  | 1,032 |  |  | 163 |  |  | 178 |  |  | 12 |  |  | 13 |
Long-term return on plan assets | (1,368 | ) |  | (1,449 | ) |  | (133 | ) |  | (129 | ) |  | — |  |  | — |
Amortization of net (gain) loss | 86 |  |  | — |  |  | (48 | ) |  | (49 | ) |  | — |  |  | (1 | )
Amortization of prior service cost | — |  |  | — |  |  | 15 |  |  | 15 |  |  | — |  |  | — |
Net Periodic Benefit Cost (Income) | $ | (331 | ) |  | $ | (417 | ) |  | $ | 74 |  |  | $ | 87 |  |  | $ | 12 |  |  | $ | 12 |
| Nine Months Ended September 30,
| Pension Plan |  | Other Postretirement Benefits |  | Executive Retirement Program
| 2011 |  | 2010 |  | 2011 |  | 2010 |  | 2011 |  | 2010
|  |  |  |  | (In thousands) |  |  |  |
Components of Net Periodic |  |  |  |  |  |  |  |  |  |  |
Benefit Cost (Income) |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 231 |  |  | $ | 217 |  |  | $ | — |  |  | $ | — |
Interest cost | 2,853 |  |  | 3,095 |  |  | 489 |  |  | 533 |  |  | 36 |  |  | 39 |
Long-term return on plan assets | (4,104 | ) |  | (4,346 | ) |  | (399 | ) |  | (386 | ) |  | — |  |  | — |
Amortization of net (gain) loss | 258 |  |  | — |  |  | (144 | ) |  | (147 | ) |  | — |  |  | (3 | )
Amortization of prior service cost | — |  |  | — |  |  | 45 |  |  | 45 |  |  | — |  |  | — |
Net Periodic Benefit Cost (Income) | $ | (993 | ) |  | $ | (1,251 | ) |  | $ | 222 |  |  | $ | 262 |  |  | $ | 36 |  |  | $ | 36 |
TNMP made contributions to its pension plan trust of $0.8 million and $1.0 million in the three months and nine months ended September 30, 2011 and $0.2 million in the three months and nine months ended September 30, 2010. TNMP anticipates making additional contributions of $0.2 million in 2011. Based on current law and estimates of portfolio performance, TNMP estimates making contributions to its pension plan trust that total $6.0 million for 2012-2015. The estimated contributions were developed using estimated discount rates and expected returns on assets to calculate the pension liabilities. Actual amounts to be funded in the future will be dependent on the actuarial assumptions at that time, including the appropriate discount rate and return on assets. TNMP contributed zero and $0.4 million to the trust for other postretirement benefits for the three months and nine months ended September 30, 2011 and zero and $0.6 million for the three months and nine months ended September 30, 2010. TNMP does not expect to make additional contributions during 2011 to the trust for other postretirement benefits. Disbursements under the executive retirement program, which are funded by the Company and considered to be contributions to the plan, were less than $0.1 million in the three months and nine months ended September 30, 2011 and 2010 and are expected to total $0.1 million during 2011.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 30 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-2 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph q -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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