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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2023
Stock-Based Compensation [Abstract] |
Stock Based Compensation | Stock-Based Compensation In July 2011, a Special Meeting of Stockholders of Heartland Express, Inc. was held, at which meeting the approval of the Heartland Express, Inc. 2011 Restricted Stock Award Plan (the “2011 Plan”) was ratified. The 2011 Plan made available up to 0.9 million shares for the purpose of making restricted stock grants to our eligible officers and employees. The 2011 Plan has no shares that remain available for the purpose of making restricted stock grants at December 31, 2023. In May 2021, at the 2021 Annual Meeting of Stockholders, the approval of the Heartland Express, Inc. 2021 Restricted Stock Award Plan (the "2021 Plan") was ratified. The 2021 Plan made available up to 0.6 million shares for the purpose of making restricted stock grants to our eligible employees, directors and consultants. The 2021 Plan has 0.5 million shares that remain available for the purpose of making restricted stock grants at December 31, 2023. There were no shares granted during the period 2011 to 2021 that remain unvested at December 31, 2023. Shares granted in 2022 through 2023 have various vesting terms that range from immediate to four years from the date of grant and have share prices ranging between $11.89 and $16.67. Compensation expense associated with these awards is based on the market value of our stock on the grant date. Compensation expense associated with restricted stock awards to employees is included in salaries, wages and benefits while awards to directors or consultants is included in other operating expenses in the consolidated statements of comprehensive income. There were no significant assumptions made in determining fair value. Compensation expense associated with restricted stock awards was $1.6 million, $1.4 million, and $1.1 million for the years ended December 31, 2023, 2022, and 2021, respectively. Unrecognized compensation expense was $0.5 million at December 31, 2023 which will be recognized over a weighted average period of 0.6 years. The following table summarizes our restricted stock award activity for the years ended December 31, 2023, 2022 and 2021. The vesting dates for the awards vested in 2023 occurred relatively evenly throughout the year ended December 31, 2023. The fair value of awards vested during 2023, 2022 and 2021 was $1.1 million, $1.2 million and $1.5 million, respectively.
| 2023
| Number of Restricted Stock Awards ( in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at January 1 | 40.1 |  |  | $ | 16.01 |
Granted | 118.9 |  |  | 14.53 |
Vested | (73.2) |  |  | 14.97 |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of year | 85.8 |  |  | $ | 14.84 |
| 2022
| Number of Restricted Stock Awards ( in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at January 1 | 14.0 |  |  | $ | 19.70 |
Granted | 106.0 |  |  | 15.19 |
Vested | (79.9) |  |  | 15.57 |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of year | 40.1 |  |  | $ | 16.01 |
| 2021
| Number of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of year | 59.7 |  |  | $ | 20.29 |
Granted | 32.1 |  |  | 17.92 |
Vested | (77.8) |  |  | 19.42 |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of year | 14.0 |  |  | $ | 19.70 |

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