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Pension and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2016
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 (collectively, the “PNM Plans” and “TNMP Plans”). PNMR maintains the legal obligation for the benefits owed to participants under these plans. Additional information concerning pension and OPEB plans is contained in Note 12 of the Notes to Consolidated Financial Statements in the 2015 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 tables present the components of the PNM Plans’ net periodic benefit cost:
| Three Months Ended March 31,
| Pension Plan |  | OPEB Plan |  | Executive Retirement Program
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
| (In thousands)
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 35 |  |  | $ | 51 |  |  | $ | — |  |  | $ | — |
Interest cost | 7,577 |  |  | 7,064 |  |  | 1,087 |  |  | 1,022 |  |  | 203 |  |  | 190 |
Expected return on plan assets | (8,854 | ) |  | (9,831 | ) |  | (1,371 | ) |  | (1,403 | ) |  | — |  |  | — |
Amortization of net (gain) loss | 3,455 |  |  | 3,705 |  |  | 286 |  |  | 491 |  |  | 64 |  |  | 81 |
Amortization of prior service cost | (241 | ) |  | (241 | ) |  | (7 | ) |  | (160 | ) |  | — |  |  | — |
Net periodic benefit cost | $ | 1,937 |  |  | $ | 697 |  |  | $ | 30 |  |  | $ | 1 |  |  | $ | 267 |  |  | $ | 271 |
PNM made contributions to its pension plan trust of $30.0 million in the three months ended March 31, 2015 and does not anticipate making any contributions to the pension plan in 2016-2020, based on current law, including recent amendments to funding requirements, and estimates of portfolio performance. These anticipations were developed using current funding assumptions, with discount rates of 4.8% to 5.7%. Actual amounts to be funded in the future will be dependent on the actuarial assumptions at that time, including the appropriate discount rate. PNM may make additional contributions at its discretion. PNM made contributions to the OPEB trust of $0.8 million and $0.8 million in the three months ended March 31, 2016 and 2015. PNM expects to make contributions to the OPEB trust totaling $3.5 million in 2016 and $14.0 million for 2017-2020. Disbursements under the executive retirement program, which are funded by PNM and considered to be contributions to the plan, were $0.5 million and $0.5 million in the three months ended March 31, 2016 and 2015 and are expected to total $1.5 million during 2016 and $5.9 million for 2017-2020. TNMP Plans The following tables present the components of the TNMP Plans’ net periodic benefit cost (income):
| Three Months Ended March 31,
| Pension Plan |  | OPEB Plan |  | Executive Retirement Program
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
| (In thousands)
Components of Net Periodic Benefit Cost (Income) |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 46 |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |
Interest cost | 826 |  |  | 761 |  |  | 169 |  |  | 152 |  |  | 10 |  |  | 9 |
Expected return on plan assets | (986 | ) |  | (1,105 | ) |  | (122 | ) |  | (130 | ) |  | — |  |  | — |
Amortization of net (gain) loss | 175 |  |  | 195 |  |  | (10 | ) |  | — |  |  | 1 |  |  | 1 |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Cost (Income) | $ | 15 |  |  | $ | (149 | ) |  | $ | 83 |  |  | $ | 84 |  |  | $ | 11 |  |  | $ | 10 |
TNMP made no contribution to its pension trust in 2015 and does not anticipate making any contributions in 2016-2020, based on current law, including recent amendments to funding requirements, and estimates of portfolio performance. These anticipations were developed using current funding assumptions with discount rates of 4.8% to 5.7%. Actual amounts to be funded in the future will depend on the actuarial assumptions at that time, including the appropriate discount rate. TNMP may make additional contributions at its discretion. TNMP made no contributions to the OPEB trust in the three months ended March 31, 2016 and 2015. TNMP expects to make contributions to the OPEB trust totaling $0.3 million in 2016 and $1.4 million for 2017-2020. Disbursements under the executive retirement program, which are funded by TNMP and considered to be contributions to the plan, were less than $0.1 million in the three months ended March 31, 2016 and 2015 and are expected to total $0.1 million during 2016 and $0.4 million in 2017-2020.

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