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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [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. In May 2021, at the 2021 Annual Meeting of Stockholders, the Heartland Express, Inc. 2021 Restricted Stock Award Plan (the "2021 Plan") was approved. 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. All shares granted and vested during the three months ended March 31, 2022, as well as shares that remain unvested at March 31, 2022, were issued from the 2011 plan. There were no shares that were issued during the period 2011 to 2018 that remain unvested at March 31, 2022. Shares granted in 2019 through 2022 have various vesting terms that range from immediate to four years from the date of grant. 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 is included in salaries, wages and benefits 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 $0.3 million and $0.6 million respectively, for the three months ended March 31, 2022 and March 31, 2021. Unrecognized compensation expense was $0.2 million at March 31, 2022 which will be recognized over a weighted average period of 1.0 years. The following tables summarize our restricted stock award activity for the three months ended March 31, 2022 and 2021.
| Three Months Ended March 31, 2022
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 14.0 |  |  | $ | 19.70 |
Granted | 25.0 |  |  | 15.17 |
Vested | (12.0) |  |  | 15.51 |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of period | 27.0 |  |  | $ | 17.37 |
| Three Months Ended March 31, 2021
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 59.7 |  |  | $ | 20.29 |
Granted | 19.3 |  |  | 18.69 |
Vested | (25.3) |  |  | 19.78 |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of period | 53.7 |  |  | $ | 19.95 |

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- References No definition available. + Details
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