Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-148081-index-headers.html | 2021-05-03 16:38:05 | |
| 0001193125-21-148081-index.html | 2021-05-03 16:38:05 | |
| 0001193125-21-148081.txt | 2021-05-03 16:38:05 | |
 0001193125-21-148081-xbrl.zip | 11607 | 2021-05-03 16:38:05 |
| btu-20210503.xsd | 3089 | 2021-05-03 16:38:05 |
| btu-20210503_lab.xml | 17372 | 2021-05-03 16:38:05 |
| btu-20210503_pre.xml | 10966 | 2021-05-03 16:38:05 |
| d183408d8k.htm | 31612 | 2021-05-03 16:38:05 |
| d183408d8k_htm.xml | 3275 | 2021-05-03 16:38:05 |
| d183408dex991.htm | 4630 | 2021-05-03 16:38:05 |
| FilingSummary.xml | 1732 | 2021-05-03 16:38:05 |
| Financial_Report.xlsx | 5680 | 2021-05-03 16:38:05 |
 g183408g0501072630547.jpg | 3080 | 2021-05-03 16:38:05 |
| MetaLinks.json | 18430 | 2021-05-03 16:38:05 |
| R1.htm | 38618 | 2021-05-03 16:38:05 |
| report.css | 2767 | 2021-05-03 16:38:05 |
| Show.js | 1085 | 2021-05-03 16:38:05 |