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| 0000068622-19-000007-index.html | 2019-05-13 17:14:10 | |
| 0000068622-19-000007.txt | 2019-05-13 17:14:10 | |
 0000068622-19-000007-xbrl.zip | 142515 | 2019-05-13 17:14:10 |
| ctl-20190331.xml | 805551 | 2019-05-13 17:14:10 |
| ctl-20190331.xsd | 38593 | 2019-05-13 17:14:10 |
| ctl-20190331_cal.xml | 101170 | 2019-05-13 17:14:10 |
| ctl-20190331_def.xml | 137907 | 2019-05-13 17:14:10 |
| ctl-20190331_lab.xml | 498517 | 2019-05-13 17:14:10 |
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| ctq2019033110q.htm | 679577 | 2019-05-13 17:14:10 |
| ctq2019033110qex311.htm | 12492 | 2019-05-13 17:14:10 |
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| ctq2019033110qex32.htm | 7798 | 2019-05-13 17:14:10 |
| FilingSummary.xml | 32792 | 2019-05-13 17:14:10 |
| Financial_Report.xlsx | 58537 | 2019-05-13 17:14:10 |
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| report.css | 2767 | 2019-05-13 17:14:10 |
| Show.js | 1085 | 2019-05-13 17:14:10 |