Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-010686-index-headers.html | 2021-01-19 06:06:54 | |
| 0001193125-21-010686-index.html | 2021-01-19 06:06:54 | |
| 0001193125-21-010686.txt | 2021-01-19 06:06:54 | |
 0001193125-21-010686-xbrl.zip | 13703 | 2021-01-19 06:06:54 |
| btu-20210115.xsd | 3082 | 2021-01-19 06:06:54 |
| btu-20210115_lab.xml | 17374 | 2021-01-19 06:06:54 |
| btu-20210115_pre.xml | 10962 | 2021-01-19 06:06:54 |
| d215379d8k.htm | 24921 | 2021-01-19 06:06:54 |
| d215379d8k_htm.xml | 3276 | 2021-01-19 06:06:54 |
| d215379dex991.htm | 18874 | 2021-01-19 06:06:54 |
| FilingSummary.xml | 1729 | 2021-01-19 06:06:54 |
| Financial_Report.xlsx | 5455 | 2021-01-19 06:06:54 |
 g215379g0116074113252.jpg | 2919 | 2021-01-19 06:06:54 |
| MetaLinks.json | 18388 | 2021-01-19 06:06:54 |
| R1.htm | 38620 | 2021-01-19 06:06:54 |
| report.css | 2767 | 2021-01-19 06:06:54 |
| Show.js | 1085 | 2021-01-19 06:06:54 |