Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-182946-index-headers.html | 2021-06-04 16:21:32 | |
| 0001193125-21-182946-index.html | 2021-06-04 16:21:32 | |
| 0001193125-21-182946.txt | 2021-06-04 16:21:32 | |
 0001193125-21-182946-xbrl.zip | 49361 | 2021-06-04 16:21:32 |
| btu-20210604.xsd | 3089 | 2021-06-04 16:21:32 |
| btu-20210604_lab.xml | 17372 | 2021-06-04 16:21:32 |
| btu-20210604_pre.xml | 10966 | 2021-06-04 16:21:32 |
| d194127d8k.htm | 28160 | 2021-06-04 16:21:32 |
| d194127d8k_htm.xml | 3276 | 2021-06-04 16:21:32 |
| d194127dex11.htm | 188374 | 2021-06-04 16:21:32 |
| d194127dex51.htm | 7879 | 2021-06-04 16:21:32 |
| FilingSummary.xml | 1765 | 2021-06-04 16:21:32 |
| Financial_Report.xlsx | 5678 | 2021-06-04 16:21:32 |
 g194127g0603125533645.jpg | 1874 | 2021-06-04 16:21:32 |
 g194127g0603125534098.jpg | 1389 | 2021-06-04 16:21:32 |
| MetaLinks.json | 18460 | 2021-06-04 16:21:32 |
| R1.htm | 38622 | 2021-06-04 16:21:32 |
| report.css | 2767 | 2021-06-04 16:21:32 |
| Show.js | 1085 | 2021-06-04 16:21:32 |