Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-169437-index-headers.html | 2021-05-21 17:13:32 | |
| 0001193125-21-169437-index.html | 2021-05-21 17:13:32 | |
| 0001193125-21-169437.txt | 2021-05-21 17:13:32 | |
 0001193125-21-169437-xbrl.zip | 7977 | 2021-05-21 17:13:32 |
| btu-20210521.xsd | 3091 | 2021-05-21 17:13:32 |
| btu-20210521_lab.xml | 17374 | 2021-05-21 17:13:32 |
| btu-20210521_pre.xml | 10968 | 2021-05-21 17:13:32 |
| d152637d8k.htm | 23390 | 2021-05-21 17:13:32 |
| d152637d8k_htm.xml | 3276 | 2021-05-21 17:13:32 |
| FilingSummary.xml | 1697 | 2021-05-21 17:13:32 |
| Financial_Report.xlsx | 5675 | 2021-05-21 17:13:32 |
| MetaLinks.json | 18460 | 2021-05-21 17:13:32 |
| R1.htm | 38618 | 2021-05-21 17:13:32 |
| report.css | 2766 | 2021-05-21 17:13:32 |
| Show.js | 1084 | 2021-05-21 17:13:32 |