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|---|---|---|
 0000799233-20-000004-index-headers.html | 2020-01-24 18:07:45 | |
| 0000799233-20-000004-index.html | 2020-01-24 18:07:45 | |
| 0000799233-20-000004.txt | 2020-01-24 18:07:45 | |
 0000799233-20-000004-xbrl.zip | 28962 | 2020-01-24 18:07:45 |
| a2019q4earningsrelease.htm | 332591 | 2020-01-24 18:07:45 |
 chart-c58286e8fbc5475d.jpg | 222547 | 2020-01-24 18:07:45 |
 chart-df5e77393aa34158.jpg | 118625 | 2020-01-24 18:07:45 |
| FilingSummary.xml | 1734 | 2020-01-24 18:07:45 |
| Financial_Report.xlsx | 5787 | 2020-01-24 18:07:45 |
| htld-20200123.htm | 53062 | 2020-01-24 18:07:45 |
| htld-20200123.xsd | 2588 | 2020-01-24 18:07:45 |
| htld-20200123_cal.xml | 726 | 2020-01-24 18:07:45 |
| htld-20200123_def.xml | 1690 | 2020-01-24 18:07:45 |
| htld-20200123_htm.xml | 11380 | 2020-01-24 18:07:45 |
| htld-20200123_lab.xml | 23965 | 2020-01-24 18:07:45 |
| htld-20200123_pre.xml | 12662 | 2020-01-24 18:07:45 |
| MetaLinks.json | 18059 | 2020-01-24 18:07:45 |
| R1.htm | 38600 | 2020-01-24 18:07:45 |
| report.css | 2767 | 2020-01-24 18:07:45 |
| Show.js | 1085 | 2020-01-24 18:07:45 |