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|---|---|---|
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| 0000799233-13-000025-index.html | 2013-05-10 12:00:07 | |
| 0000799233-13-000025.txt | 2013-05-10 12:00:07 | |
 0000799233-13-000025-xbrl.zip | 109571 | 2013-05-10 12:00:07 |
| exhibit3112013q1.htm | 23596 | 2013-05-10 12:00:07 |
| exhibit3122013q1.htm | 24743 | 2013-05-10 12:00:07 |
| exhibit3212013q1.htm | 9724 | 2013-05-10 12:00:07 |
| exhibit3222013q1.htm | 10611 | 2013-05-10 12:00:07 |
| FilingSummary.xml | 18138 | 2013-05-10 12:00:07 |
| Financial_Report.xls | 445571 | 2013-05-10 12:00:07 |
| htld-20130331.xml | 486073 | 2013-05-10 12:00:07 |
| htld-20130331.xsd | 28213 | 2013-05-10 12:00:07 |
| htld-20130331_cal.xml | 49632 | 2013-05-10 12:00:07 |
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| htld-20130331_lab.xml | 423090 | 2013-05-10 12:00:07 |
| htld-20130331_pre.xml | 229781 | 2013-05-10 12:00:07 |
| htld2013q110q.htm | 600694 | 2013-05-10 12:00:07 |
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| report.css | 2721 | 2013-05-10 12:00:07 |
| Show.js | 6423 | 2013-05-10 12:00:07 |