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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2021
EMPLOYEE BENEFIT PLANS |
Schedule of changes in benefit obligations and plan assets and disclosure of funded status and accumulated benefit obligation of nonunion defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Supplemental | ​ | Postretirement |
​ | ​ | Benefit Plan | ​ | Health Benefit Plan |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
​ | ​ | (in thousands) |
Change in benefit obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligations, beginning of year | ​ | $ | 392 | ​ | $ | 3,236 | ​ | $ | 18,751 | ​ | $ | 20,630 | ​
Service cost | ​ |  | — | ​ |  | — | ​ |  | 192 | ​ |  | 187 | ​
Interest cost | ​ |  | 4 | ​ |  | 9 | ​ |  | 427 | ​ |  | 576 | ​
Actuarial (gain) loss(1) | ​ |  | (15) | ​ |  | 34 | ​ |  | (1,736) | ​ |  | (2,027) | ​
Benefits paid | ​ |  | — | ​ |  | (2,887) | ​ |  | (642) | ​ |  | (615) | ​
Benefit obligations, end of year | ​ |  | 381 | ​ |  | 392 | ​ |  | 16,992 | ​ |  | 18,751 | ​
Change in plan assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan asset, beginning of year | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Employer contributions | ​ |  | — | ​ |  | 2,887 | ​ |  | 642 | ​ |  | 615 | ​
Benefits paid | ​ |  | — | ​ |  | (2,887) | ​ |  | (642) | ​ |  | (615) | ​
Fair value of plan assets, end of year | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Funded status at period end | ​ | $ | (381) | ​ | $ | (392) | ​ | $ | (16,992) | ​ | $ | (18,751) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated benefit obligation | ​ | $ | 381 | ​ | $ | 392 | ​ | $ | 16,992 | ​ | $ | 18,751 | ​
(1) | The actuarial gain on the postretirement health benefit plan for 2021 and 2020 is primarily related to the impact of actuarial assumptions on the valuation of plan costs. For 2021, these actuarial assumptions include an increase in the discount rate used to remeasure the plan obligation at December 31, 2021 versus December 31, 2020 and lower actual healthcare premium costs versus the assumed trend rates. For 2020, these actuarial assumptions include lower health care cost trend rates, partially offset by a decrease in the discount rate used to remeasure the plan obligation at December 31, 2020 versus December 31, 2019.
​
Schedule of amounts recognized in the consolidated balance sheets related to nonunion defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Supplemental | ​ | Postretirement |
​ | ​ | Benefit Plan | ​ | Health Benefit Plan |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Current portion of pension and postretirement liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | (640) | ​ | $ | (588) | ​
Pension and postretirement liabilities, less current portion | ​ |  | (381) | ​ |  | (392) | ​ |  | (16,352) | ​ |  | (18,163) | ​
Liabilities recognized | ​ | $ | (381) | ​ | $ | (392) | ​ | $ | (16,992) | ​ | $ | (18,751) | ​
​
Summary of the components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nonunion Defined | ​ | Supplemental | ​ | Postretirement | ​
​ | ​ | Benefit Pension Plan | ​ | Benefit Plan | ​ | Health Benefit Plan | ​
​ |  | 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​ |  | ​ | ​
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 192 | ​ | $ | 187 | ​ | $ | 320 | ​
Interest cost | ​ |  | — | ​ |  | — | ​ |  | 624 | ​ |  | 4 | ​ |  | 9 | ​ |  | 39 | ​ |  | 427 | ​ |  | 576 | ​ |  | 1,212 | ​
Expected return on plan assets | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (31) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Amortization of prior service credit | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | (33) | ​
Pension settlement expense(1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,164 | ​ | ​ | — | ​ | ​ | 89 | ​ | ​ | 370 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Amortization of net actuarial (gain) loss(2) | ​ |  | — | ​ |  | — | ​ |  | 260 | ​ |  | 9 | ​ |  | 8 | ​ |  | 95 | ​ |  | (548) | ​ |  | (597) | ​ |  | 898 | ​
Net periodic benefit cost | ​ | $ | — | ​ | $ | — | ​ | $ | 5,017 | ​ | $ | 13 | ​ | $ | 106 | ​ | $ | 504 | ​ | $ | 71 | ​ | $ | 165 | ​ | $ | 2,397 | ​
(1) | For 2019, the presentation of pension settlement expense excludes a $4.0 million noncash pension termination expense which is further described within this Note.
(2) | The Company amortizes actuarial gains and losses over the average remaining active service period of the plan participants and does not use a corridor approach.
Summary of pension settlement distributions and settlement expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nonunion Defined | ​ | Supplemental |
​ | ​ | Benefit Pension Plan | ​ | Benefit Plan |
​ |  | 2021 |  | 2020 |  | 2019(1) |  | 2021 |  | 2020(2) |  | 2019(3) |
​ | ​ | (in thousands, except per share data) |
Pension settlement distributions | ​ | $ | — | ​ | $ | — | ​ | $ | 33,938 | ​ | $ | — | ​ | $ | 2,887 | ​ | $ | 937 | ​
Pension settlement expense, pre-tax(4) | ​ | $ | — | ​ | $ | — | ​ | $ | 4,164 | ​ | $ | — | ​ | $ | 89 | ​ | $ | 370 | ​
Pension settlement expense per diluted share, net of taxes | ​ | $ | — | ​ | $ | — | ​ | $ | 0.12 | ​ | $ | — | ​ | $ | — | ​ | $ | 0.01 | ​
(1) | Pension settlement distributions for 2019 represent $18.4 million of lump-sum benefit distributions, including participant-elected distributions associated with the plan’s termination, a $14.0 million nonparticipating annuity contract purchase, and a $1.5 million transfer of benefit obligations to the PBGC.
(2) | The 2020 SBP distributions include the portion of a benefit related to an officer retirement that occurred in 2019 which was delayed for six months after retirement in accordance with IRC Section 409A.
(3) | The 2019 SBP distribution excludes the portion of the benefit related to an officer retirement which was delayed for six months after retirement in accordance with IRC Section 409A. The pension settlement expense related to the delayed distribution was recognized in 2019.
(4) | For 2019, the presentation of pension settlement expense excludes a $4.0 million noncash pension termination expense which is further described within this Note.
​
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Supplemental | ​ | Postretirement |
​ | ​ | Benefit Plan | ​ | Health Benefit Plan |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Unrecognized net actuarial (gain) loss | ​ | $ | 40 | ​ | $ | 64 | ​ | $ | (5,642) | ​ | $ | (4,454) | ​
​
Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost for nonunion defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Supplemental | ​ | Postretirement |
​ | ​ | Benefit Plan | ​ | Health Benefit Plan |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Discount rate | ​ | 1.8 | % | 1.1 | % | 2.7 | % | 2.3 | %
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nonunion Defined | ​ | Supplemental | ​ | Postretirement |
​ | ​ | Benefit Pension Plan | ​ | Benefit Plan | ​ | Health Benefit Plan |
​ |  | 2021 |  | 2020 |  | 2019(1) |  | 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |
Discount rate | ​ | N/A | ​ | N/A | ​ | 3.9 | % | 1.1 | % | 2.4 | % | 3.6 | % | 2.3 | % | 3.1 | % | 4.2 | %
Expected return on plan assets | ​ | N/A | ​ | N/A | ​ | 1.4 | % | N/A |  | N/A |  | N/A |  | N/A |  | N/A |  | N/A | ​
(1) | The discount rate presented was used to determine the first quarter 2019 expense, and the short-term discount rate established upon quarterly settlements in 2019 of 3.8% and 3.7%, was used to calculate the expense for the second and third quarter of 2019, respectively. The expected return on plan assets presented was used to determine nonunion pension expense for first quarter 2019, and no expected return on plan assets was assumed for the second and third quarters of 2019.
Schedule of the assumed health care cost trend rates for the postretirement health benefit plan | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |
Health care cost trend rate assumed for next year(1) | ​ | 7.0 | % | 7.0 | %
Rate to which the cost trend rate is assumed to decline | ​ | 4.5 | % | 4.5 | %
Year that the rate reaches the cost trend assumed rate |  | 2033 |  | 2032 |
(1) | At each December 31 measurement date, health care cost rates for the following year are based on known premiums for the fully-insured postretirement health benefit plan. Therefore, the first year of assumed health care cost trend rates presented as of December 31, 2021 and 2020 are for 2023 and 2022, respectively.
Schedule of estimated future benefit payments for nonunion defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Supplemental |  | Postretirement |
​ | ​ | Benefit | ​ | Health |
​ | ​ | Plan | ​ | Benefit Plan |
​ | ​ | ​ | ​ | ​ | ​ | ​ |
2022 | ​ | $ | — | ​ | $ | 640 | ​
2023 | ​ | $ | — | ​ | $ | 633 | ​
2024 | ​ | $ | — | ​ | $ | 584 | ​
2025 | ​ | $ | — | ​ | $ | 605 | ​
2026 | ​ | $ | — | ​ | $ | 642 | ​
2027-2031 | ​ | $ | 424 | ​ | $ | 3,522 | ​
​
Schedule of multiemployer pension funds and key participation information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Pension | ​ | FIP/RP | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Protection Act | ​ | Status | ​ | Contributions (d) | ​ | ​
​ | ​ | EIN/Pension | ​ | Zone Status (b) | ​ | Pending/ | ​ | (in thousands) | ​ | Surcharge
Legal Name of Plan |  | Plan Number (a) |  | 2021 |  | 2020 |  | Implemented (c) |  | 2021 |  | 2020 |  | 2019 |  | Imposed (e)
Central States, Southeast and Southwest Areas Pension Plan(1)(2) |  | 36-6044243 |  | Critical and Declining |  | Critical and Declining |  | Implemented(3) | ​ | $ | 71,045 | ​ | $ | 68,704 | ​ | $ | 75,803 |  | No
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Western Conference of Teamsters Pension Plan(2) |  | 91-6145047 |  | Green |  | Green |  | No | ​ |  | 25,861 | ​ |  | 23,633 | ​ |  | 24,860 |  | No
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Central Pennsylvania Teamsters Defined Benefit Plan(1)(2) |  | 23-6262789 |  | Green |  | Green |  | No | ​ |  | 13,931 | ​ |  | 13,485 | ​ |  | 13,907 |  | No
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
I. B. of T. Union Local No. 710 Pension Fund(5)(6) |  | 36-2377656 |  | Green(4) |  | Green(4) |  | No | ​ |  | 9,553 | ​ |  | 9,885 | ​ |  | 10,164 |  | No
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
New England Teamsters Pension Fund(7)(8) |  | 04-6372430 |  | Critical and Declining(9) |  | Critical and Declining(9) |  | Implemented(10) | ​ |  | 4,357 | ​ |  | 4,464 | ​ |  | 4,802 | ​ | No
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
All other plans in the aggregate | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 22,146 | ​ |  | 22,023 | ​ |  | 24,210 | ​ | ​
Total multiemployer pension contributions paid(11) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 146,893 | ​ | $ | 142,194 | ​ | $ | 153,746 | ​ | ​
Table Heading Definitions ​
(a) | The “EIN/Pension Plan Number” column provides the Federal Employer Identification Number (EIN) and the three-digit plan number, if applicable.
(b) | Unless otherwise noted, the most recent PPA zone status available in 2021 and 2020 is for the plan’s year-end status at December 31, 2020 and 2019, respectively, and prior to financial assistance from the Pension Relief Act. The zone status is based on information received from the plan and was certified by the plan’s actuary. Green zone funds are those that are in neither endangered, critical, or critical and declining status and generally have a funded percentage of at least 80%.
(c) | The “FIP/RP Status Pending/Implemented” column indicates if a funding improvement plan (FIP) or a rehabilitation plan (RP), if applicable, is pending or has been implemented.
(d) | Amounts reflect contributions made in the respective year and differ from amounts expensed during the year.
(e) | The surcharge column indicates if a surcharge was paid by ABF Freight to the plan.
​
| (1) | ABF Freight System, Inc. was listed by the plan as providing more than 5% of the total contributions to the plan for the plan years ended December 31, 2020 and 2019.
| (2) | Information for this fund was obtained from the annual funding notice, other notices received from the plan, and the Form 5500 filed for the plan years ended December 31, 2020 and 2019.
| (3) | Adopted a rehabilitation plan effective March 25, 2008 as updated. Utilized amortization extension granted by the IRS effective December 31, 2003.
| (4) | PPA zone status relates to plan years February 1, 2020 – January 31, 2021 and February 1, 2019 – January 31, 2020.
| (5) | The Company was listed by the plan as providing more than 5% of the total contributions to the plan for the plan year ended January 31, 2020.
| (6) | Information for this fund was obtained from the annual funding notice, other notices received from the plan, and the Form 5500 filed for the plan years ended January 31, 2021 and 2020.
| (7) | Contributions include $1.6 million for 2021, 2020, and 2019, respectively, related to the multiemployer pension fund withdrawal liability. ABF Freight’s multiemployer pension plan obligation with the New England Teamsters and Trucking Industry Pension Fund was restructured under a transition agreement effective on August 1, 2018, which triggered a withdrawal liability settlement to satisfy ABF Freight’s existing potential withdrawal liability obligation to the fund. ABF
|  | Freight recognized a one-time charge of $37.9 million (pre-tax) to record the withdrawal liability in second quarter 2018; partially settled the withdrawal liability through the initial lump sum cash payment of $15.1 million made in third quarter 2018; and will settle the remainder with monthly payments over a period of 23 years.
| (8) | Information for this fund was obtained from the annual funding notice, other notices received from the plan, and the Form 5500 filed for the plan years ended September 30, 2020 and 2019.
| (9) | PPA zone status relates to plan years October 1, 2020 – September 30, 2021 and October 1, 2019 – September 30, 2020.
| (10) | Adopted a rehabilitation plan effective January 1, 2009.
| (11) | Contribution levels can be impacted by several factors such as changes in business levels and the related time worked by contractual employees, contractual rate increases for pension benefits, and the specific funding structure, which differs among funds. The 2018 ABF NMFA and the related supplemental agreements provided for contributions to multiemployer pension plans to be frozen at the current rates for each fund, although certain funds have imposed contribution increases under their rehabilitation or funding improvement plans. The year-over-year changes in multiemployer pension plan contributions presented above were influenced by changes in Asset-Based business levels. Due to the negative impact of the COVID-19 pandemic on tonnage levels, most significantly in the second quarter of 2020, the Company made operational changes in the Asset-Based network in the second and third quarters of 2020, including workforce reductions to better align resources with business levels. The reduction in hours worked by a portion of ABF Freight’s contractual employees contributed to lower contributions to multiemployer pension plans for 2020. An increase in hours worked by ABF Freight’s contractual employees in 2021, as well as additional contractual employees hired primarily in the second half of the year, to service higher shipment levels in response to increased customer demand resulted in an increase in multiemployer pension contributions for 2021, compared to 2020.

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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans and disclosure of accumulated benefit obligation. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + 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 (l) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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