Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-167931-index-headers.html | 2021-05-20 17:11:06 | |
| 0001193125-21-167931-index.html | 2021-05-20 17:11:06 | |
| 0001193125-21-167931.txt | 2021-05-20 17:11:06 | |
 0001193125-21-167931-xbrl.zip | 7840 | 2021-05-20 17:11:06 |
| btu-20210518.xsd | 3091 | 2021-05-20 17:11:06 |
| btu-20210518_lab.xml | 17374 | 2021-05-20 17:11:06 |
| btu-20210518_pre.xml | 10968 | 2021-05-20 17:11:06 |
| d170547d8k.htm | 22894 | 2021-05-20 17:11:06 |
| d170547d8k_htm.xml | 3276 | 2021-05-20 17:11:06 |
| FilingSummary.xml | 1697 | 2021-05-20 17:11:06 |
| Financial_Report.xlsx | 5674 | 2021-05-20 17:11:06 |
| MetaLinks.json | 18460 | 2021-05-20 17:11:06 |
| R1.htm | 38618 | 2021-05-20 17:11:06 |
| report.css | 2766 | 2021-05-20 17:11:06 |
| Show.js | 1084 | 2021-05-20 17:11:06 |