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Pension and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | A reconciliation of the changes in Level 3 fair value measurements is as follows:
| Fixed Income - Corporate
PNMR Master Trust | PNM Pension |  | TNMP Pension |  | Total Master Trust
| (In thousands)
Balance at December 31, 2015 | $ | 719 |  |  | $ | 78 |  |  | $ | 797 |
Actual return on assets sold during the period | 1 |  |  | — |  |  | 1 |
Actual return on assets still held at period end | 19 |  |  | 2 |  |  | 21 |
Purchases | — |  |  | — |  |  | — |
Sales | (387 | ) |  | (42 | ) |  | (429 | )
Balance at December 31, 2016 | 352 |  |  | 38 |  |  | 390 |
Actual return on assets sold during the period | 1 |  |  | — |  |  | 1 |
Actual return on assets still held at period end | (7 | ) |  | (1 | ) |  | (8 | )
Purchases | 92 |  |  | 10 |  |  | 102 |
Sales | (247 | ) |  | (26 | ) |  | (273 | )
Balance at December 31, 2017 | $ | 191 |  |  | $ | 21 |  |  | $ | 212 |
The following table presents information about the PBO, fair value of plan assets, and funded status of the plans:
| PNM Plan |  | TNMP Plan
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (In thousands)
PBO at beginning of year | $ | 621,751 |  |  | $ | 597,900 |  |  | $ | 67,061 |  |  | $ | 64,198 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 26,908 |  |  | 30,307 |  |  | 2,887 |  |  | 3,304 |
Actuarial (gain) loss | 26,298 |  |  | 39,463 |  |  | 3,050 |  |  | 4,318 |
Benefits paid | (50,974 | ) |  | (45,919 | ) |  | (4,575 | ) |  | (4,759 | )
PBO at end of year | 623,983 |  |  | 621,751 |  |  | 68,423 |  |  | 67,061 |
Fair value of plan assets at beginning of year | 543,601 |  |  | 557,923 |  |  | 60,624 |  |  | 62,082 |
Actual return on plan assets | 69,389 |  |  | 31,597 |  |  | 7,450 |  |  | 3,301 |
Employer contributions | — |  |  | — |  |  | — |  |  | — |
Benefits paid | (50,974 | ) |  | (45,919 | ) |  | (4,575 | ) |  | (4,759 | )
Fair value of plan assets at end of year | 562,016 |  |  | 543,601 |  |  | 63,499 |  |  | 60,624 |
Funded status – asset (liability) for pension benefits | $ | (61,967 | ) |  | $ | (78,150 | ) |  | $ | (4,924 | ) |  | $ | (6,437 | )
The following table presents information about the APBO, the fair value of plan assets, and the funded status of the plans:
| PNM Plan |  | TNMP Plan
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (In thousands)
APBO at beginning of year | $ | 94,269 |  |  | $ | 84,674 |  |  | $ | 12,830 |  |  | $ | 13,106 |
Service cost | 96 |  |  | 140 |  |  | 143 |  |  | 186 |
Interest cost | 4,025 |  |  | 4,346 |  |  | 556 |  |  | 677 |
Participant contributions | 3,069 |  |  | 2,690 |  |  | 379 |  |  | 520 |
Actuarial (gain) loss | (1,601 | ) |  | 17,877 |  |  | (381 | ) |  | (96 | )
Benefits paid | (9,961 | ) |  | (11,734 | ) |  | (1,248 | ) |  | (1,563 | )
Plan design changes | — |  |  | (3,724 | ) |  | — |  |  | — |
APBO at end of year | 89,897 |  |  | 94,269 |  |  | 12,279 |  |  | 12,830 |
Fair value of plan assets at beginning of year | 72,694 |  |  | 72,952 |  |  | 8,544 |  |  | 9,111 |
Actual return on plan assets | 14,222 |  |  | 5,923 |  |  | 1,642 |  |  | 476 |
Employer contributions | 332 |  |  | 2,863 |  |  | 685 |  |  | — |
Participant contributions | 3,069 |  |  | 2,690 |  |  | 379 |  |  | 520 |
Benefits paid | (9,961 | ) |  | (11,734 | ) |  | (1,248 | ) |  | (1,563 | )
Fair value of plan assets at end of year | 80,356 |  |  | 72,694 |  |  | 10,002 |  |  | 8,544 |
Funded status – asset (liability) | $ | (9,541 | ) |  | $ | (21,575 | ) |  | $ | (2,277 | ) |  | $ | (4,286 | )
Schedule of Assumptions Used | The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost (income). Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost (income) would be affected.
| Year Ended December 31,
PNM Plan | 2017 |  | 2016 |  | 2015
Discount rate for determining December 31 PBO | 4.05 | % |  | 4.51 | % |  | 5.29 | %
Discount rate for determining net periodic benefit cost (income) | 4.51 | % |  | 5.29 | % |  | 4.48 | %
Expected return on plan assets | 6.40 | % |  | 6.50 | % |  | 6.80 | %
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
TNMP Plan |  |  |  |  |
Discount rate for determining December 31 PBO | 4.01 | % |  | 4.49 | % |  | 5.39 | %
Discount rate for determining net periodic benefit cost (income) | 4.49 | % |  | 5.39 | % |  | 4.39 | %
Expected return on plan assets | 6.40 | % |  | 6.50 | % |  | 6.80 | %
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
Actuarial (gain) loss results from changes in:
| PNM Plan |  | TNMP Plan
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Discount rates | $ | 27,547 |  |  | $ | 41,849 |  |  | $ | 3,528 |  |  | $ | 5,055 |
Demographic experience | (1,249 | ) |  | (334 | ) |  | (517 | ) |  | (556 | )
Other assumption and experience | — |  |  | (2,052 | ) |  | 39 |  |  | (181 | )
| $ | 26,298 |  |  | $ | 39,463 |  |  | $ | 3,050 |  |  | $ | 4,318 |
Actuarial (gain) loss results from changes in:
| PNM Plan |  | TNMP Plan
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Discount rates | $ | 3,536 |  |  | $ | 6,569 |  |  | $ | 613 |  |  | $ | 1,112 |
Claims, contributions, and demographic experience | (5,845 | ) |  | 19,562 |  |  | (994 | ) |  | (102 | )
Assumed participation rate | — |  |  | (6,335 | ) |  | — |  |  | (1,013 | )
Mortality rate | — |  |  | (691 | ) |  | — |  |  | (93 | )
Medical benefits | 1,425 |  |  | (1,228 | ) |  | — |  |  | — |
Dental trend assumption | (717 | ) |  | — |  |  | — |  |  | — |
| $ | (1,601 | ) |  | $ | 17,877 |  |  | $ | (381 | ) |  | $ | (96 | )
The following significant weighted-average assumptions were used to determine the APBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the APBO and net periodic benefit cost would be affected.
| Year Ended December 31,
PNM Plan | 2017 |  | 2016 |  | 2015
Discount rate for determining December 31 APBO | 4.00 | % |  | 4.47 | % |  | 5.34 | %
Discount rate for determining net periodic benefit cost | 4.47 | % |  | 5.34 | % |  | 4.45 | %
Expected return on plan assets | 7.50 | % |  | 7.70 | % |  | 7.70 | %
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
TNMP Plan |  |  |  |  |
Discount rate for determining December 31 APBO | 4.00 | % |  | 4.47 | % |  | 5.34 | %
Discount rate for determining net periodic benefit cost | 4.47 | % |  | 5.34 | % |  | 4.45 | %
Expected return on plan assets | 5.40 | % |  | 5.70 | % |  | 5.70 | %
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost would be affected.
| Year Ended December 31,
PNM Plan | 2017 |  | 2016 |  | 2015
Discount rate for determining December 31 PBO | 4.05 | % |  | 4.51 | % |  | 5.29 | %
Discount rate for determining net periodic benefit cost | 4.51 | % |  | 5.29 | % |  | 4.48 | %
Long-term rate of return on plan assets | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
TNMP Plan |  |  |  |  |
Discount rate for determining December 31 PBO | 4.01 | % |  | 4.49 | % |  | 5.39 | %
Discount rate for determining net periodic benefit cost | 4.49 | % |  | 5.39 | % |  | 4.39 | %
Long-term rate of return on plan assets | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year | The following table presents pre-tax information about net actuarial loss in AOCI as of December 31, 2017.
| December 31, 2017
| PNM Plan |  | TNMP Plan
| (In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost at beginning of year | $ | 2,299 |  |  | $ | — |
Experience (gain) loss | 674 |  |  | 44 |
Regulatory asset (liability) adjustment | (391 | ) |  | (44 | )
Amortization recognized in net periodic benefit cost (income) | (132 | ) |  | — |
Amount in AOCI not yet recognized in net periodic benefit cost at end of year | $ | 2,450 |  |  | $ | — |
Amortization expected to be recognized in 2018 | $ | 151 |  |  | $ | — |
The following table presents pre-tax information about prior service cost and net actuarial (gain) loss in AOCI as of December 31, 2017.
| PNM Plan |  | TNMP Plan
| December 31, 2017 |  | December 31, 2017
| Prior service cost |  | Net actuarial (gain) loss |  | Net actuarial (gain) loss
| (In thousands)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year | $ | (1,450 | ) |  | $ | 159,149 |  |  | $ | — |
Experience (gain) loss | — |  |  | (9,288 | ) |  | (621 | )
Regulatory asset (liability) adjustment | — |  |  | 5,387 |  |  | 621 |
Amortization recognized in net periodic benefit cost (income) | 405 |  |  | (6,722 | ) |  | — |
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year | $ | (1,045 | ) |  | $ | 148,526 |  |  | $ | — |
Amortization expected to be recognized in 2018 | $ | (405 | ) |  | $ | 6,653 |  |  | $ | — |
Schedule of Net Benefit Costs | The following table presents the components of net periodic benefit cost:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
PNM Plan |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 697 |  |  | 812 |  |  | 760 |
Amortization of net (gain) loss | 313 |  |  | 256 |  |  | 325 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 1,010 |  |  | $ | 1,068 |  |  | $ | 1,085 |
TNMP Plan |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 33 |  |  | 40 |  |  | 36 |
Amortization of net (gain) loss | 9 |  |  | 2 |  |  | 5 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 42 |  |  | $ | 42 |  |  | $ | 41 |
The following table presents the components of net periodic benefit cost (income):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
PNM Plan |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 26,908 |  |  | 30,307 |  |  | 28,255 |
Expected return on plan assets | (33,803 | ) |  | (35,416 | ) |  | (39,323 | )
Amortization of net (gain) loss | 16,006 |  |  | 13,820 |  |  | 14,820 |
Amortization of prior service cost | (965 | ) |  | (965 | ) |  | (965 | )
Net periodic benefit cost | $ | 8,146 |  |  | $ | 7,746 |  |  | $ | 2,787 |
TNMP Plan |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 2,887 |  |  | 3,304 |  |  | 3,043 |
Expected return on plan assets | (3,779 | ) |  | (3,943 | ) |  | (4,420 | )
Amortization of net (gain) loss | 923 |  |  | 700 |  |  | 782 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | 31 |  |  | $ | 61 |  |  | $ | (595 | )
The following table presents the components of net periodic benefit cost:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
PNM Plan |  |  |  |  |
Service cost | $ | 96 |  |  | $ | 140 |  |  | $ | 204 |
Interest cost | 4,025 |  |  | 4,346 |  |  | 4,089 |
Expected return on plan assets | (5,230 | ) |  | (5,483 | ) |  | (5,610 | )
Amortization of net (gain) loss | 3,682 |  |  | 1,145 |  |  | 1,966 |
Amortization of prior service credit | (1,663 | ) |  | (30 | ) |  | (642 | )
Net periodic benefit cost | $ | 910 |  |  | $ | 118 |  |  | $ | 7 |
TNMP Plan |  |  |  |  |
Service cost | $ | 143 |  |  | $ | 186 |  |  | $ | 247 |
Interest cost | 556 |  |  | 677 |  |  | 608 |
Expected return on plan assets | (456 | ) |  | (490 | ) |  | (520 | )
Amortization of net (gain) loss | (79 | ) |  | (40 | ) |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 164 |  |  | $ | 333 |  |  | $ | 335 |
Schedule of Expected Benefit Payments | The following pension benefit payments are expected to be paid:
| PNM Plan |  | TNMP Plan
| (In thousands)
2018 | $ | 49,221 |  |  | $ | 5,929 |
2019 | 48,639 |  |  | 5,215 |
2020 | 47,069 |  |  | 5,108 |
2021 | 45,246 |  |  | 5,373 |
2022 | 44,232 |  |  | 4,856 |
2023 - 2027 | 201,389 |  |  | 22,085 |
The following other postretirement benefit payments, which reflect expected future service and are net of participant contributions, are expected to be paid:
| PNM Plan |  | TNMP Plan
| (In thousands)
2018 | $ | 7,829 |  |  | $ | 708 |
2019 | 7,730 |  |  | 725 |
2020 | 7,605 |  |  | 748 |
2021 | 7,442 |  |  | 774 |
2022 | 7,132 |  |  | 795 |
2023 - 2027 | 31,250 |  |  | 4,126 |
The following executive retirement plan payments, which reflect expected future service, are expected:
| PNM Plan |  | TNMP Plan
| (In thousands)
2018 | $ | 1,501 |  |  | $ | 93 |
2019 | 1,473 |  |  | 91 |
2020 | 1,441 |  |  | 89 |
2021 | 1,405 |  |  | 85 |
2022 | 1,363 |  |  | 81 |
2023 - 2027 | 6,014 |  |  | 324 |
Schedule of Health Care Cost Trend Rates | The following table shows the assumed health care cost trend rates for the PNM postretirement benefit plan:
| PNM Plan
| December 31,
| 2017 |  | 2016
Health care cost trend rate assumed for next year | 6.5 | % |  | 6.8 | %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.0 | % |  | 5.0 | %
Year that the rate reaches the ultimate trend rate | 2024 |  |  | 2024 |
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | The following table shows the impact of a one-percentage-point change in assumed health care cost trend rates:
| PNM Plan
| 1-Percentage- Point Increase |  | 1-Percentage- Point Decrease
| (In thousands)
Effect on total of service and interest cost | $ | 72 |  |  | $ | (111 | )
Effect on APBO | $ | 1,452 |  |  | $ | (2,235 | )
Schedule of Net Funded Status | For the executive retirement programs, the following table presents information about the PBO and funded status of the plans:
| PNM Plan |  | TNMP Plan
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (In thousands)
PBO at beginning of year | $ | 16,212 |  |  | $ | 16,105 |  |  | $ | 787 |  |  | $ | 794 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 697 |  |  | 812 |  |  | 33 |  |  | 40 |
Actuarial (gain) loss | 674 |  |  | 768 |  |  | 44 |  |  | 47 |
Benefits paid | (1,466 | ) |  | (1,473 | ) |  | (93 | ) |  | (94 | )
PBO at end of year – funded status | 16,117 |  |  | 16,212 |  |  | 771 |  |  | 787 |
Less current liability | 1,501 |  |  | 1,510 |  |  | 93 |  |  | 93 |
Non-current liability | $ | 14,616 |  |  | $ | 14,702 |  |  | $ | 678 |  |  | $ | 694 |
Summary of Expenses for Other Retirement Plans | A summary of expenses for these other retirement plans is as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
PNMR |  |  |  |  |
401(k) plan | $ | 16,452 |  |  | $ | 17,762 |  |  | $ | 16,725 |
Non-qualified plan | $ | 3,702 |  |  | $ | 2,017 |  |  | $ | 1,436 |
PNM |  |  |  |  |
401(k) plan | $ | 12,120 |  |  | $ | 13,397 |  |  | $ | 12,679 |
Non-qualified plan | $ | 2,834 |  |  | $ | 1,535 |  |  | $ | 1,090 |
TNMP |  |  |  |  |
401(k) plan | $ | 4,332 |  |  | $ | 4,365 |  |  | $ | 4,046 |
Non-qualified plan | $ | 868 |  |  | $ | 482 |  |  | $ | 346 |

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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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