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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2012
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. The shares granted under the Plan are service based awards beginning December 14, 2011 and 20% of the awards vest 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, grant date, was $13.57. 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 $2.4 million and $0.2 million for the years ended December 31, 2012 and 2011, respectively. Unrecognized compensation expense was $2.2 million at December 31, 2012. 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 years ended December 31, 2012 and December 31, 2011. The vesting date for all awards vested in 2012 was June 1, 2012. There were no restricted stock awards granted or outstanding during 2010.
| 2012
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of year | 351 |  |  | $ | 13.57 |
Granted | — |  |  | $ | — |
Vested | (70 | ) |  | $ | 13.57 |
Forfeited | (4 | ) |  | $ | 13.57 |
Outstanding (unvested) at end of year | 277 |  |  | $ | 13.57 |
| 2011
| Number of Shares of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value
Unvested at beginning of year | — |  |  | $ | — |
Granted | 351 |  |  | $ | 13.57 |
Vested | — |  |  | $ | — |
Forfeited | — |  |  | $ | — |
Outstanding (unvested) at end of year | 351 |  |  | $ | 13.57 |

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- Definition No authoritative reference available. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: 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. Reference 6: 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 7: 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 8: 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 + Details
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