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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2019
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 "Plan") was ratified. 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 2016 through 2019 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 $1.6 million respectively, for the three and nine months ended September 30, 2019. Compensation expense associated with restricted stock awards was $0.1 million and $0.4 million respectively, for the three and nine months ended September 30, 2018. Unrecognized compensation expense was $0.4 million at September 30, 2019 which will be recognized over a weighted average period of 0.7 years.

The following tables summarize our restricted stock award activity for the three and nine months ended September 30, 2019 and 2018.

 
Three Months Ended September 30, 2019
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
58.5

 
$
19.83

Granted
5.0

 
20.38

Vested
(15.2
)
 
18.60

Forfeited
—

 
—

Outstanding (unvested) at end of period
48.3

 
$
20.28



 
Three Months Ended September 30, 2018
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
35.0

 
$
20.29

Granted
—

 
—

Vested
(8.5
)
 
17.11

Forfeited
—

 
—

Outstanding (unvested) at end of period
26.5

 
$
21.31


 
Nine Months Ended September 30, 2019
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
26.5

 
$
21.31

Granted
92.5

 
19.47

Vested
(70.2
)
 
19.63

Forfeited
(0.5
)
 
17.11

Outstanding (unvested) at end of period
48.3

 
$
20.28


 
Nine Months Ended September 30, 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
5.0

 
19.03

Vested
(30.7
)
 
22.03

Forfeited
(1.5
)
 
17.11

Outstanding (unvested) at end of period
26.5

 
$
21.31