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| 0001704715-20-000056-index.html | 2020-12-10 16:20:38 | |
| 0001704715-20-000056.txt | 2020-12-10 16:20:38 | |
 0001704715-20-000056-xbrl.zip | 17587 | 2020-12-10 16:20:38 |
| a12102020exhibit991.htm | 43792 | 2020-12-10 16:20:38 |
| ctra-20201210.htm | 37947 | 2020-12-10 16:20:38 |
| ctra-20201210.xsd | 2438 | 2020-12-10 16:20:38 |
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| Financial_Report.xlsx | 5425 | 2020-12-10 16:20:38 |
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| Show.js | 1085 | 2020-12-10 16:20:38 |