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| 0000018926-18-000012-index.html | 2018-02-28 21:59:48 | |
| 0000018926-18-000012.txt | 2018-02-28 21:59:48 | |
 0000018926-18-000012-xbrl.zip | 540985 | 2018-02-28 21:59:48 |
| ctl-20171231.xml | 4868731 | 2018-02-28 21:59:48 |
| ctl-20171231.xsd | 88905 | 2018-02-28 21:59:48 |
| ctl-20171231_cal.xml | 163060 | 2018-02-28 21:59:48 |
| ctl-20171231_def.xml | 685448 | 2018-02-28 21:59:48 |
| ctl-20171231_lab.xml | 1560526 | 2018-02-28 21:59:48 |
| ctl-20171231_pre.xml | 952357 | 2018-02-28 21:59:48 |
| ctl2017123110k.htm | 3425217 | 2018-02-28 21:59:48 |
| ctl20171231ex12.htm | 50233 | 2018-02-28 21:59:48 |
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| ctl20171231ex42b.htm | 1794806 | 2018-02-28 21:59:48 |
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| FilingSummary.xml | 53916 | 2018-02-28 21:59:48 |
| Financial_Report.xlsx | 187196 | 2018-02-28 21:59:48 |
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| report.css | 2768 | 2018-02-28 21:59:48 |
| Show.js | 1411 | 2018-02-28 21:59:48 |