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| 0000799233-16-000068-index.html | 2016-05-10 14:36:27 | |
| 0000799233-16-000068.txt | 2016-05-10 14:36:27 | |
 0000799233-16-000068-xbrl.zip | 101928 | 2016-05-10 14:36:27 |
| exhibit3112016q1.htm | 23570 | 2016-05-10 14:36:27 |
| exhibit3122016q1.htm | 24717 | 2016-05-10 14:36:27 |
| exhibit3212016q1.htm | 9720 | 2016-05-10 14:36:27 |
| exhibit3222016q1.htm | 10607 | 2016-05-10 14:36:27 |
| FilingSummary.xml | 24584 | 2016-05-10 14:36:27 |
| Financial_Report.xlsx | 47033 | 2016-05-10 14:36:27 |
| htld-20160331.xml | 404070 | 2016-05-10 14:36:27 |
| htld-20160331.xsd | 31427 | 2016-05-10 14:36:27 |
| htld-20160331_cal.xml | 58050 | 2016-05-10 14:36:27 |
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| htld-20160331_lab.xml | 430323 | 2016-05-10 14:36:27 |
| htld-20160331_pre.xml | 228248 | 2016-05-10 14:36:27 |
| htld2016q110q.htm | 625239 | 2016-05-10 14:36:27 |
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| report.css | 2767 | 2016-05-10 14:36:27 |
| Show.js | 1410 | 2016-05-10 14:36:27 |