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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table | The following table presents information about our NEOs’ pay and Company performance for each of the Company’s five most recently completed fiscal years.
PAY VERSUS PERFORMANCE TABLE
|  |  |  |  | Value of Initial Fixed $100 Investment Based On: |  |
Year | Summary Compensation Table Total for CEO ($) (1) | Compensation Actually Paid to CEO ($) (1)(2) | Average Summary Compensation Table Total for Non-CEO NEOs ($) (3) | Average Compensation Actually Paid to Non-CEO NEOs ($) (2)(3) | Total Share- holder Return ($) | 2024 Peer Group Total Share- holder Return ($) (4) | 2023 Peer Group Total Share- holder Return ($) (4) | Net Income ($) (in 000’s) | Operating Income ($) (in 000’s)
2024 | 5,824,493 |  | 2,635,157 |  | 1,558,029 |  | 1,147,387 |  | 105 |  | 152 |  | 206 |  | 33,570 |  | 66,148 |
2023 | 5,446,752 |  | 3,516,805 |  | 1,113,639 |  | 899,065 |  | 122 |  | 166 |  | 228 |  | 112,290 |  | 176,416 |
2022 | 5,460,198 |  | 2,465,428 |  | 1,094,807 |  | 701,308 |  | 115 |  | 145 |  | 175 |  | 245,580 |  | 323,076 |
2021 | 5,314,351 |  | 8,798,833 |  | 1,133,218 |  | 1,587,300 |  | 134 |  | 163 |  | 212 |  | 261,478 |  | 309,146 |
2020 | 4,810,029 |  | 6,822,876 |  | 1,102,850 |  | 1,423,523 |  | 109 |  | 115 |  | 131 |  | 169,078 |  | 227,438 |
(1) | Represents compensation of Mr. Leathers for all periods presented.
(2) | SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid.” The Reconciliation of Compensation Actually Paid Adjustments table below details the applicable adjustments that were made to determine “compensation actually paid” (all amounts are averages for the non-CEO NEOs).
(3) | The following NEOs are included in the average compensation calculations for the periods presented: 2024 – Messrs. Wikoff, Meisgeier, Downing, and Mahon; 2023 – Messrs. Wikoff, Meisgeier, Schelble, Johnson, and John J. Steele. Mr. Steele was the former EVP, Treasurer and Chief Financial Officer; and 2022, 2021, and 2020 – Messrs. Steele, Nordlund, Schelble, and Johnson.
(4) | In 2024, we selected a new Peer Group which includes companies in the trucking industry that are more similar to us than the companies included in the 2023 Peer Group. The 2024 Peer Group has the following companies: Covenant Logistics Group; Heartland Express; Hub Group; J.B. Hunt; Knight-Swift Transportation; Landstar System; Marten Transport; and Schneider National. ArcBest, Forward Air, Old Dominion Freight Line, and Saia were removed from our 2024 Peer Group, and Daseke (acquired by TFI International, Inc. in 2024) was removed from our 2024 and 2023 Peer Groups.
Named Executive Officers, Footnote | Represents compensation of Mr. Leathers for all periods presented. The following NEOs are included in the average compensation calculations for the periods presented: 2024 – Messrs. Wikoff, Meisgeier, Downing, and Mahon; 2023 – Messrs. Wikoff, Meisgeier, Schelble, Johnson, and John J. Steele. Mr. Steele was the former EVP, Treasurer and Chief Financial Officer; and 2022, 2021, and 2020 – Messrs. Steele, Nordlund, Schelble, and Johnson. |  |  |  |
Peer Group Issuers, Footnote | In 2024, we selected a new Peer Group which includes companies in the trucking industry that are more similar to us than the companies included in the 2023 Peer Group. The 2024 Peer Group has the following companies: Covenant Logistics Group; Heartland Express; Hub Group; J.B. Hunt; Knight-Swift Transportation; Landstar System; Marten Transport; and Schneider National. ArcBest, Forward Air, Old Dominion Freight Line, and Saia were removed from our 2024 Peer Group, and Daseke (acquired by TFI International, Inc. in 2024) was removed from our 2024 and 2023 Peer Groups. |  |  |  |
PEO Total Compensation Amount | $ 5,824,493 | $ 5,446,752 | $ 5,460,198 | $ 5,314,351 | $ 4,810,029
PEO Actually Paid Compensation Amount | $ 2,635,157 | 3,516,805 | 2,465,428 | 8,798,833 | 6,822,876
Adjustment To PEO Compensation, Footnote | SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid.” The Reconciliation of Compensation Actually Paid Adjustments table below details the applicable adjustments that were made to determine “compensation actually paid” (all amounts are averages for the non-CEO NEOs). The following table reconciles total compensation reported in the Summary Compensation Table to “compensation actually paid” for the CEO and non-CEO NEOs (averaged) over the last five years.
RECONCILIATION OF COMPENSATION ACTUALLY PAID ADJUSTMENTS
Year | Summary Compensation Table “Total” Column ($) | Subtract Summary Compensation Table “Stock Awards” Column ($) | Add Year End Fair Value of Unvested Equity Awards Granted in Year ($) | Add/ (Subtract) Year Over Year Change in Fair Value of Unvested Equity Awards Granted in Prior Years ($) | Add/ (Subtract) Year Over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in Year ($) | Subtract Fair Value of Prior Year Equity Awards that Failed to Meet Vesting Conditions in Year ($) | Compensation Actually Paid ($)
CEO
2024 | 5,824,493 |  | (3,900,000) |  | 1,694,988 |  | (1,026,790) |  | 42,466 |  | — |  | 2,635,157 |
2023 | 5,446,752 |  | (3,600,000) |  | 2,433,079 |  | (1,562,871) |  | 799,845 |  | — |  | 3,516,805 |
2022 | 5,460,198 |  | (3,200,000) |  | 2,507,777 |  | (2,102,923) |  | (199,624) |  | — |  | 2,465,428 |
2021 | 5,314,351 |  | (2,800,000) |  | 4,741,960 |  | 1,288,523 |  | 253,999 |  | — |  | 8,798,833 |
2020 | 4,810,029 |  | (2,800,000) |  | 4,252,764 |  | 302,174 |  | 257,909 |  | — |  | 6,822,876 |
Non-CEO NEOs (Average)
2024 | 1,558,029 |  | (857,500) |  | 553,066 |  | (104,828) |  | (1,380) |  | — |  | 1,147,387 |
2023 | 1,113,639 |  | (430,000) |  | 343,301 |  | (124,568) |  | 84,891 |  | (88,198) |  | 899,065 |
2022 | 1,094,807 |  | (350,000) |  | 274,289 |  | (287,911) |  | (29,877) |  | — |  | 701,308 |
2021 | 1,133,218 |  | (312,500) |  | 529,187 |  | 195,957 |  | 41,438 |  | — |  | 1,587,300 |
2020 | 1,102,850 |  | (412,500) |  | 626,539 |  | 49,962 |  | 56,672 |  | — |  | 1,423,523 |
Non-PEO NEO Average Total Compensation Amount | $ 1,558,029 | 1,113,639 | 1,094,807 | 1,133,218 | 1,102,850
Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,147,387 | 899,065 | 701,308 | 1,587,300 | 1,423,523
Adjustment to Non-PEO NEO Compensation Footnote | SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid.” The Reconciliation of Compensation Actually Paid Adjustments table below details the applicable adjustments that were made to determine “compensation actually paid” (all amounts are averages for the non-CEO NEOs). The following table reconciles total compensation reported in the Summary Compensation Table to “compensation actually paid” for the CEO and non-CEO NEOs (averaged) over the last five years.
RECONCILIATION OF COMPENSATION ACTUALLY PAID ADJUSTMENTS
Year | Summary Compensation Table “Total” Column ($) | Subtract Summary Compensation Table “Stock Awards” Column ($) | Add Year End Fair Value of Unvested Equity Awards Granted in Year ($) | Add/ (Subtract) Year Over Year Change in Fair Value of Unvested Equity Awards Granted in Prior Years ($) | Add/ (Subtract) Year Over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in Year ($) | Subtract Fair Value of Prior Year Equity Awards that Failed to Meet Vesting Conditions in Year ($) | Compensation Actually Paid ($)
CEO
2024 | 5,824,493 |  | (3,900,000) |  | 1,694,988 |  | (1,026,790) |  | 42,466 |  | — |  | 2,635,157 |
2023 | 5,446,752 |  | (3,600,000) |  | 2,433,079 |  | (1,562,871) |  | 799,845 |  | — |  | 3,516,805 |
2022 | 5,460,198 |  | (3,200,000) |  | 2,507,777 |  | (2,102,923) |  | (199,624) |  | — |  | 2,465,428 |
2021 | 5,314,351 |  | (2,800,000) |  | 4,741,960 |  | 1,288,523 |  | 253,999 |  | — |  | 8,798,833 |
2020 | 4,810,029 |  | (2,800,000) |  | 4,252,764 |  | 302,174 |  | 257,909 |  | — |  | 6,822,876 |
Non-CEO NEOs (Average)
2024 | 1,558,029 |  | (857,500) |  | 553,066 |  | (104,828) |  | (1,380) |  | — |  | 1,147,387 |
2023 | 1,113,639 |  | (430,000) |  | 343,301 |  | (124,568) |  | 84,891 |  | (88,198) |  | 899,065 |
2022 | 1,094,807 |  | (350,000) |  | 274,289 |  | (287,911) |  | (29,877) |  | — |  | 701,308 |
2021 | 1,133,218 |  | (312,500) |  | 529,187 |  | 195,957 |  | 41,438 |  | — |  | 1,587,300 |
2020 | 1,102,850 |  | (412,500) |  | 626,539 |  | 49,962 |  | 56,672 |  | — |  | 1,423,523 |
Compensation Actually Paid vs. Total Shareholder Return | The following graphs illustrate the relationships between each of the financial performance measures included in the Pay Versus Performance Table above and the compensation actually paid to the CEO and, on average, to non-CEO NEOs over the Company’s five most recently completed fiscal years. |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |  |
Total Shareholder Return Vs Peer Group | The following graphs illustrate the relationships between each of the financial performance measures included in the Pay Versus Performance Table above and the compensation actually paid to the CEO and, on average, to non-CEO NEOs over the Company’s five most recently completed fiscal years. |  |  |  |
Tabular List, Table | Revenues, less fuel surcharge revenues •Operating income •Diluted earnings per share |  |  |  |
Total Shareholder Return Amount | $ 105 | 122 | 115 | 134 | 109
Peer Group Total Shareholder Return Amount | 152 | 166 | 145 | 163 | 115
Net Income (Loss) | $ 33,570,000 | $ 112,290,000 | $ 245,580,000 | $ 261,478,000 | $ 169,078,000
Company Selected Measure Amount | 66,148,000 | 176,416,000 | 323,076,000 | 309,146,000 | 227,438,000
PEO Name | Mr. Leathers |  |  |  |
Peer Group Total Shareholder Return Amount, Other Peer Group | $ 206 | $ 228 | $ 175 | $ 212 | $ 131
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | •Revenues, less fuel surcharge revenues |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | •Operating income |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Diluted earnings per share |  |  |  |
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (3,900,000) | (3,600,000) | (3,200,000) | (2,800,000) | (2,800,000)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 1,694,988 | 2,433,079 | 2,507,777 | 4,741,960 | 4,252,764
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (1,026,790) | (1,562,871) | (2,102,923) | 1,288,523 | 302,174
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 42,466 | 799,845 | (199,624) | 253,999 | 257,909
PEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0 | 0
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (857,500) | (430,000) | (350,000) | (312,500) | (412,500)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 553,066 | 343,301 | 274,289 | 529,187 | 626,539
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (104,828) | (124,568) | (287,911) | 195,957 | 49,962
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (1,380) | 84,891 | (29,877) | 41,438 | 56,672
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ 0 | $ (88,198) | $ 0 | $ 0 | $ 0

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