Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-246106-index-headers.html | 2021-08-13 16:23:02 | |
| 0001193125-21-246106-index.html | 2021-08-13 16:23:02 | |
| 0001193125-21-246106.txt | 2021-08-13 16:23:02 | |
 0001193125-21-246106-xbrl.zip | 10202 | 2021-08-13 16:23:02 |
| btu-20210811.xsd | 2903 | 2021-08-13 16:23:02 |
| btu-20210811_lab.xml | 17373 | 2021-08-13 16:23:02 |
| btu-20210811_pre.xml | 10961 | 2021-08-13 16:23:02 |
| d171591d8k.htm | 26520 | 2021-08-13 16:23:02 |
| d171591d8k_htm.xml | 3276 | 2021-08-13 16:23:02 |
| d171591dex991.htm | 8196 | 2021-08-13 16:23:02 |
| FilingSummary.xml | 1729 | 2021-08-13 16:23:02 |
| Financial_Report.xlsx | 5675 | 2021-08-13 16:23:02 |
 g171591snap01.jpg | 3208 | 2021-08-13 16:23:02 |
 g171591snap02.jpg | 1530 | 2021-08-13 16:23:02 |
 g171591snap03.jpg | 1641 | 2021-08-13 16:23:02 |
| MetaLinks.json | 18331 | 2021-08-13 16:23:02 |
| R1.htm | 38621 | 2021-08-13 16:23:02 |
| report.css | 2767 | 2021-08-13 16:23:02 |
| Show.js | 1085 | 2021-08-13 16:23:02 |