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Pension and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 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 |
Actual return on assets sold during the period | (7 | ) |  | (1 | ) |  | (8 | )
Actual return on assets still held at period end | (1 | ) |  | — |  |  | (1 | )
Purchases | 192 |  |  | 23 |  |  | 215 |
Sales | (87 | ) |  | (10 | ) |  | (97 | )
Balance at December 31, 2018 | $ | 288 |  |  | $ | 33 |  |  | $ | 321 |
The following table presents information about the PBO, fair value of plan assets, and funded status of the plans:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
PBO at beginning of year | $ | 623,983 |  |  | $ | 621,751 |  |  | $ | 68,423 |  |  | $ | 67,061 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 24,270 |  |  | 26,908 |  |  | 2,625 |  |  | 2,887 |
Actuarial (gain) loss | (41,025 | ) |  | 26,298 |  |  | (5,216 | ) |  | 3,050 |
Benefits paid | (42,970 | ) |  | (50,974 | ) |  | (5,245 | ) |  | (4,575 | )
PBO at end of year | 564,258 |  |  | 623,983 |  |  | 60,587 |  |  | 68,423 |
Fair value of plan assets at beginning of year | 562,016 |  |  | 543,601 |  |  | 63,499 |  |  | 60,624 |
Actual return on plan assets | (29,068 | ) |  | 69,389 |  |  | (3,180 | ) |  | 7,450 |
Employer contributions | — |  |  | — |  |  | — |  |  | — |
Benefits paid | (42,970 | ) |  | (50,974 | ) |  | (5,245 | ) |  | (4,575 | )
Fair value of plan assets at end of year | 489,978 |  |  | 562,016 |  |  | 55,074 |  |  | 63,499 |
Funded status – asset (liability) for pension benefits | $ | (74,280 | ) |  | $ | (61,967 | ) |  | $ | (5,513 | ) |  | $ | (4,924 | )
The following table presents information about the APBO, the fair value of plan assets, and the funded status of the plans:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
APBO at beginning of year | $ | 89,897 |  |  | $ | 94,269 |  |  | $ | 12,279 |  |  | $ | 12,830 |
Service cost | 83 |  |  | 96 |  |  | 134 |  |  | 143 |
Interest cost | 3,439 |  |  | 4,025 |  |  | 477 |  |  | 556 |
Participant contributions | 2,390 |  |  | 3,069 |  |  | 174 |  |  | 379 |
Actuarial (gain) loss | (12,206 | ) |  | (1,601 | ) |  | (2,213 | ) |  | (381 | )
Benefits paid | (8,298 | ) |  | (9,961 | ) |  | (787 | ) |  | (1,248 | )
APBO at end of year | 75,305 |  |  | 89,897 |  |  | 10,064 |  |  | 12,279 |
Fair value of plan assets at beginning of year | 80,356 |  |  | 72,694 |  |  | 10,002 |  |  | 8,544 |
Actual return on plan assets | (7,669 | ) |  | 14,222 |  |  | (988 | ) |  | 1,642 |
Employer contributions | 2,924 |  |  | 332 |  |  | 343 |  |  | 685 |
Participant contributions | 2,390 |  |  | 3,069 |  |  | 174 |  |  | 379 |
Benefits paid | (8,298 | ) |  | (9,961 | ) |  | (787 | ) |  | (1,248 | )
Fair value of plan assets at end of year | 69,703 |  |  | 80,356 |  |  | 8,744 |  |  | 10,002 |
Funded status – asset (liability) | $ | (5,602 | ) |  | $ | (9,541 | ) |  | $ | (1,320 | ) |  | $ | (2,277 | )
Schedule of Assumptions Used | 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 | 2018 |  | 2017 |  | 2016
Discount rate for determining December 31 PBO | 4.66 | % |  | 4.05 | % |  | 4.51 | %
Discount rate for determining net periodic benefit cost | 4.05 | % |  | 4.51 | % |  | 5.29 | %
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 |  |  |  |  |
Discount rate for determining December 31 PBO | 4.63 | % |  | 4.01 | % |  | 4.49 | %
Discount rate for determining net periodic benefit cost | 4.01 | % |  | 4.49 | % |  | 5.39 | %
Long-term rate of return on plan assets | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
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 | 2018 |  | 2017 |  | 2016
Discount rate for determining December 31 APBO | 4.63 | % |  | 4.00 | % |  | 4.47 | %
Discount rate for determining net periodic benefit cost | 4.00 | % |  | 4.47 | % |  | 5.34 | %
Expected return on plan assets | 7.42 | % |  | 7.50 | % |  | 7.70 | %
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
TNMP |  |  |  |  |
Discount rate for determining December 31 APBO | 4.63 | % |  | 4.00 | % |  | 4.47 | %
Discount rate for determining net periodic benefit cost | 4.00 | % |  | 4.47 | % |  | 5.34 | %
Expected return on plan assets | 5.86 | % |  | 5.40 | % |  | 5.70 | %
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
Actuarial (gain) loss results from changes in:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Discount rates | $ | (34,769 | ) |  | $ | 27,547 |  |  | $ | (4,278 | ) |  | $ | 3,528 |
Demographic experience | 431 |  |  | (1,249 | ) |  | (301 | ) |  | (517 | )
Mortality rate | (6,966 | ) |  | — |  |  | (705 | ) |  | — |
Other assumptions and experience | 279 |  |  | — |  |  | 68 |  |  | 39 |
| $ | (41,025 | ) |  | $ | 26,298 |  |  | $ | (5,216 | ) |  | $ | 3,050 |
Actuarial (gain) loss results from changes in:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Discount rates | $ | (4,076 | ) |  | $ | 3,536 |  |  | $ | (710 | ) |  | $ | 613 |
Claims, contributions, and demographic experience | (3,174 | ) |  | (5,845 | ) |  | 72 |  |  | (994 | )
Assumed participation rate | (4,040 | ) |  | — |  |  | (1,461 | ) |  | — |
Mortality rate | (916 | ) |  | — |  |  | (114 | ) |  | — |
Medical benefits | — |  |  | 1,425 |  |  | — |  |  | — |
Dental trend assumption | — |  |  | (717 | ) |  | — |  |  | — |
| $ | (12,206 | ) |  | $ | (1,601 | ) |  | $ | (2,213 | ) |  | $ | (381 | )
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 | 2018 |  | 2017 |  | 2016
Discount rate for determining December 31 PBO | 4.65 | % |  | 4.05 | % |  | 4.51 | %
Discount rate for determining net periodic benefit cost (income) | 4.05 | % |  | 4.51 | % |  | 5.29 | %
Expected return on plan assets | 6.54 | % |  | 6.40 | % |  | 6.50 | %
Rate of compensation increase | N/A |  |  | N/A |  |  | N/A |
TNMP |  |  |  |  |
Discount rate for determining December 31 PBO | 4.63 | % |  | 4.01 | % |  | 4.49 | %
Discount rate for determining net periodic benefit cost (income) | 4.01 | % |  | 4.49 | % |  | 5.39 | %
Expected return on plan assets | 6.57 | % |  | 6.40 | % |  | 6.50 | %
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 prior service cost and net actuarial (gain) loss in AOCI as of December 31, 2018.
| PNM |  | TNMP
| December 31, 2018 |  | December 31, 2018
| 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 | $ | (1,045 | ) |  | $ | 148,526 |  |  | $ | — |
Experience (gain) loss | — |  |  | 22,728 |  |  | 1,926 |
Regulatory asset (liability) adjustment | 1,045 |  |  | (13,571 | ) |  | (1,926 | )
Amortization recognized in net periodic benefit cost (income) | — |  |  | (7,409 | ) |  | — |
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year | $ | — |  |  | $ | 150,274 |  |  | $ | — |
Amortization expected to be recognized in 2019 | $ | — |  |  | $ | 7,270 |  |  | $ | — |
The following table presents pre-tax information about net actuarial loss in AOCI as of December 31, 2018.
| December 31, 2018
| PNM |  | TNMP
| (In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost at beginning of year | $ | 2,450 |  |  | $ | — |
Experience (gain) loss | (508 | ) |  | 4 |
Regulatory asset (liability) adjustment | 295 |  |  | (4 | )
Amortization recognized in net periodic benefit cost (income) | (151 | ) |  | — |
Amount in AOCI not yet recognized in net periodic benefit cost at end of year | $ | 2,086 |  |  | $ | — |
Amortization expected to be recognized in 2019 | $ | 133 |  |  | $ | — |
Schedule of Net Benefit Costs | The following table presents the components of net periodic benefit cost (income):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | 83 |  |  | $ | 96 |  |  | $ | 140 |
Interest cost | 3,439 |  |  | 4,025 |  |  | 4,346 |
Expected return on plan assets | (5,414 | ) |  | (5,230 | ) |  | (5,483 | )
Amortization of net (gain) loss | 2,354 |  |  | 3,682 |  |  | 1,145 |
Amortization of prior service credit | (1,664 | ) |  | (1,663 | ) |  | (30 | )
Net periodic benefit cost (income) | $ | (1,202 | ) |  | $ | 910 |  |  | $ | 118 |
TNMP |  |  |  |  |
Service cost | $ | 134 |  |  | $ | 143 |  |  | $ | 186 |
Interest cost | 477 |  |  | 556 |  |  | 677 |
Expected return on plan assets | (542 | ) |  | (456 | ) |  | (490 | )
Amortization of net (gain) loss | (227 | ) |  | (79 | ) |  | (40 | )
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | (158 | ) |  | $ | 164 |  |  | $ | 333 |
The following table presents the components of net periodic benefit cost:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 622 |  |  | 697 |  |  | 812 |
Amortization of net (gain) loss | 359 |  |  | 313 |  |  | 256 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 981 |  |  | $ | 1,010 |  |  | $ | 1,068 |
TNMP |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 29 |  |  | 33 |  |  | 40 |
Amortization of net (gain) loss | 15 |  |  | 9 |  |  | 2 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 44 |  |  | $ | 42 |  |  | $ | 42 |
The following table presents the components of net periodic benefit cost (income):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 24,270 |  |  | 26,908 |  |  | 30,307 |
Expected return on plan assets | (34,686 | ) |  | (33,803 | ) |  | (35,416 | )
Amortization of net (gain) loss | 16,348 |  |  | 16,006 |  |  | 13,820 |
Amortization of prior service cost | (965 | ) |  | (965 | ) |  | (965 | )
Net periodic benefit cost | $ | 4,967 |  |  | $ | 8,146 |  |  | $ | 7,746 |
TNMP |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 2,625 |  |  | 2,887 |  |  | 3,304 |
Expected return on plan assets | (3,963 | ) |  | (3,779 | ) |  | (3,943 | )
Amortization of net (gain) loss | 1,088 |  |  | 923 |  |  | 700 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | (250 | ) |  | $ | 31 |  |  | $ | 61 |
Schedule of Expected Benefit Payments | The following OPEB payments, which reflect expected future service and are net of participant contributions, are expected to be paid:
| PNM |  | TNMP
| (In thousands)
2019 | $ | 7,365 |  |  | $ | 629 |
2020 | 7,309 |  |  | 653 |
2021 | 7,029 |  |  | 674 |
2022 | 6,653 |  |  | 699 |
2023 | 6,351 |  |  | 714 |
2024 - 2028 | 26,678 |  |  | 3,558 |
The following pension benefit payments are expected to be paid:
| PNM |  | TNMP
| (In thousands)
2019 | $ | 46,125 |  |  | $ | 5,137 |
2020 | 45,595 |  |  | 5,065 |
2021 | 44,804 |  |  | 5,005 |
2022 | 44,000 |  |  | 4,886 |
2023 | 43,066 |  |  | 4,667 |
2024 - 2028 | 199,157 |  |  | 21,075 |
The following executive retirement plan payments, which reflect expected future service, are expected:
| PNM |  | TNMP
| (In thousands)
2019 | $ | 1,627 |  |  | $ | 141 |
2020 | 1,463 |  |  | 91 |
2021 | 1,427 |  |  | 88 |
2022 | 1,385 |  |  | 84 |
2023 | 1,337 |  |  | 79 |
2024 - 2028 | 5,792 |  |  | 301 |
Schedule of Health Care Cost Trend Rates | The following table shows the assumed health care cost trend rates for the PNM OPEB plan:
| PNM
| December 31,
| 2018 |  | 2017
Health care cost trend rate assumed for next year | 6.5 | % |  | 6.5 | %
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 | 2026 |  |  | 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
| 1-Percentage- Point Increase |  | 1-Percentage- Point Decrease
| (In thousands)
Effect on total of service and interest cost | $ | 60 |  |  | $ | 100 |
Effect on APBO | $ | 1,158 |  |  | $ | (1,529 | )
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 |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
PBO at beginning of year | $ | 16,117 |  |  | $ | 16,212 |  |  | $ | 771 |  |  | $ | 787 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 622 |  |  | 697 |  |  | 29 |  |  | 33 |
Actuarial (gain) loss | (508 | ) |  | 674 |  |  | (4 | ) |  | 44 |
Benefits paid | (1,505 | ) |  | (1,466 | ) |  | (94 | ) |  | (93 | )
PBO at end of year – funded status | 14,726 |  |  | 16,117 |  |  | 702 |  |  | 771 |
Less current liability | 1,627 |  |  | 1,501 |  |  | 141 |  |  | 93 |
Non-current liability | $ | 13,099 |  |  | $ | 14,616 |  |  | $ | 561 |  |  | $ | 678 |
Summary of Expenses for Other Retirement Plans | A summary of expenses for these other retirement plans is as follows:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
PNMR |  |  |  |  |
401(k) plan | $ | 16,677 |  |  | $ | 16,452 |  |  | $ | 17,762 |
Non-qualified plan | $ | 865 |  |  | $ | 3,702 |  |  | $ | 2,017 |
PNM |  |  |  |  |
401(k) plan | $ | 12,052 |  |  | $ | 12,120 |  |  | $ | 13,397 |
Non-qualified plan | $ | 621 |  |  | $ | 2,834 |  |  | $ | 1,535 |
TNMP |  |  |  |  |
401(k) plan | $ | 4,625 |  |  | $ | 4,332 |  |  | $ | 4,365 |
Non-qualified plan | $ | 244 |  |  | $ | 868 |  |  | $ | 482 |

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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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