Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-153354-index-headers.html | 2021-05-06 16:31:14 | |
| 0001193125-21-153354-index.html | 2021-05-06 16:31:14 | |
| 0001193125-21-153354.txt | 2021-05-06 16:31:14 | |
 0001193125-21-153354-xbrl.zip | 8807 | 2021-05-06 16:31:14 |
| btu-20210506.xsd | 3080 | 2021-05-06 16:31:14 |
| btu-20210506_lab.xml | 17372 | 2021-05-06 16:31:14 |
| btu-20210506_pre.xml | 10960 | 2021-05-06 16:31:14 |
| d43661d8k.htm | 39545 | 2021-05-06 16:31:14 |
| d43661d8k_htm.xml | 3276 | 2021-05-06 16:31:14 |
| FilingSummary.xml | 1691 | 2021-05-06 16:31:14 |
| Financial_Report.xlsx | 5677 | 2021-05-06 16:31:14 |
| MetaLinks.json | 18384 | 2021-05-06 16:31:14 |
| R1.htm | 38619 | 2021-05-06 16:31:14 |
| report.css | 2766 | 2021-05-06 16:31:14 |
| Show.js | 1084 | 2021-05-06 16:31:14 |