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| 0000068622-19-000003-index.html | 2019-03-21 20:46:13 | |
| 0000068622-19-000003.txt | 2019-03-21 20:46:13 | |
 0000068622-19-000003-xbrl.zip | 249974 | 2019-03-21 20:46:13 |
| ctl-20181231.xml | 1607122 | 2019-03-21 20:46:13 |
| ctl-20181231.xsd | 52596 | 2019-03-21 20:46:13 |
| ctl-20181231_cal.xml | 101407 | 2019-03-21 20:46:13 |
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| ctl-20181231_lab.xml | 772210 | 2019-03-21 20:46:13 |
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| ctq2018123110k.htm | 1513030 | 2019-03-21 20:46:13 |
| ctq20181231ex311.htm | 12055 | 2019-03-21 20:46:13 |
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| ctq20181231ex32.htm | 8477 | 2019-03-21 20:46:13 |
| FilingSummary.xml | 44044 | 2019-03-21 20:46:13 |
| Financial_Report.xlsx | 106182 | 2019-03-21 20:46:13 |
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| report.css | 2767 | 2019-03-21 20:46:13 |
| Show.js | 1085 | 2019-03-21 20:46:13 |