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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2018
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 Plan was ratified. The Plan is administered by the Compensation Committee of our Board of Directors. Per the terms of the awards, employees receiving awards will have all of the rights of a stockholder with respect to the unvested restricted shares including, but not limited to, the right to receive such cash dividends, if any, as may be declared on such shares from time to time and the right to vote such shares at any meeting of our stockholders. The Plan made available up to 0.9 million shares for the purpose of making restricted stock grants to our eligible officers and employees. Shares granted in 2013 through 2017 have various vesting terms that range from immediate to four years from the date of grant. Once vested, there are no other restrictions on the awards. Compensation expense associated with these awards is based on the market value of our stock on the grant date. Our market closing price ranged between $13.86 and $18.18 on the various grant dates for the shares granted in 2013. The Company's market close price ranged between $21.72 and $27.47 on the various grant dates during 2014, ranged between $19.93 and $27.29 on the various grant dates during 2015, ranged between $17.06 and $18.78 on the various grant dates during 2016, and ranged between $20.53 and $23.37 during 2017. There were no grants issued during the three months ended March 31, 2018. There were no significant assumptions made in determining the fair value. Compensation expense associated with restricted stock awards is included in salaries, wages and benefits in the consolidated statements of comprehensive income. Compensation expense associated with restricted stock awards was $0.1 million for the three months ended March 31, 2018. Compensation expense associated with restricted stock awards was $0.1 million for the three months ended March 31, 2017. Unrecognized compensation expense was $0.4 million at March 31, 2018 which will be recognized over a weighted average period of 1.0 year. The following tables summarize our restricted stock award activity for the three months ended March 31, 2018 and 2017.
| Three Months Ended March 31, 2018
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 53.7 |  |  | $ | 21.82 |
Granted | — |  |  | — |
Vested | (13.5 | ) |  | 24.86 |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of period | 40.2 |  |  | $ | 20.79 |
| Three Months Ended March 31, 2017
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 53.0 |  |  | $ | 21.53 |
Granted | — |  |  | — |
Vested | (8.5 | ) |  | 26.12 |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of period | 44.5 |  |  | $ | 20.33 |

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- Definition Stock-Based Compensation [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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