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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2013
Stock-Based Compensation [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Stock-Based Compensation On July 11, 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 is administered by the Compensation Committee of the Company's Board of Directors (the "Committee"). In accordance with and subject to the provisions of the Plan, the Committee has the authority to determine all provisions of awards of restricted stock, including, without limitation, the employees of the Company who will receive awards, the number of shares awarded to individual employees, the time or times when awards will be granted, restrictions and other conditions (including, for example, the lapse of time) to which the vesting of awards may be subject, and other terms and conditions and form of agreement to be entered into by the Company and employees subject to awards of restricted stock. The Committee may allocate all or any portion of its responsibilities and powers under the Plan to any one or more of its members, the Chief Executive Officer, or other senior members of management as the Committee deems appropriate. 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 stockholders of the Company. The Plan made available up to 0.9 million shares for the purpose of making restricted stock grants to eligible officers and employees of the Company. During December 2011, 0.4 million shares were granted to employees and no additional shares were granted during 2012. During the three month and six month periods ended June 30, 2013 there was a new grant of 2,000 shares to an employee. The original shares granted under the Plan are service based awards beginning December 14, 2011 and 20% of the awards vest each June 1st through 2016. The new grant during 2013 is a service based award beginning June 24, 2013 and 33.3% of the award vests each June 1st through 2016. Once vested, there are no other restrictions on the awards. Compensation expense associated with these awards is based on the market value of the Company's stock on the grant date. The Company's market closing price on December 14, 2011 and June 24, 2013, grant dates, was $13.57 and $13.86 respectively. 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 $0.4 million, $0.7 million, $0.6 million, and $1.6 million for the three and six months ended June 30, 2013 and 2012, respectively. Unrecognized compensation expense was $1.6 million at June 30, 2013. Unrecognized compensation expense will be recognized over a weighted average period of 1.8 years from the grant date of December 14, 2011 and total period of 4.5 years. The following table summarizes the Company's restricted stock award activity for the three months ended June 30, 2013 and June 30, 2012.
| Three months ended June 30, 2013
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 274.4 |  |  | $ | 13.57 |
Granted | 2.0 |  |  | 13.86 |
Vested | (67.0 | ) |  | — |
Forfeited | (6.4 | ) |  | 13.57 |
Outstanding (unvested) at end of period | 203.0 |  |  | $ | 13.57 |
| Six months ended June 30, 2013
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 276.8 |  |  | $ | 13.57 |
Granted | 2.0 |  |  | 13.86 |
Vested | (67.0 | ) |  | — |
Forfeited | (8.8 | ) |  | 13.57 |
Outstanding (unvested) at end of period | 203.0 |  |  | $ | 13.57 |
| Three and six months ended June 30, 2012
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 351.0 |  |  | $ | 13.57 |
Granted | — |  |  | — |
Vested | (70.0 | ) |  | — |
Forfeited | — |  |  | — |
Outstanding (unvested) at end of period | 281.0 |  |  | $ | 13.57 |

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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 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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