Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-005466-index-headers.html | 2021-01-08 21:50:32 | |
| 0001193125-21-005466-index.html | 2021-01-08 21:50:32 | |
| 0001193125-21-005466.txt | 2021-01-08 21:50:32 | |
 0001193125-21-005466-xbrl.zip | 13568 | 2021-01-08 21:50:32 |
| btu-20210108.xsd | 3080 | 2021-01-08 21:50:32 |
| btu-20210108_lab.xml | 17372 | 2021-01-08 21:50:32 |
| btu-20210108_pre.xml | 10960 | 2021-01-08 21:50:32 |
| d38263d8k.htm | 25474 | 2021-01-08 21:50:32 |
| d38263d8k_htm.xml | 3276 | 2021-01-08 21:50:32 |
| d38263dex991.htm | 17743 | 2021-01-08 21:50:32 |
| FilingSummary.xml | 1725 | 2021-01-08 21:50:32 |
| Financial_Report.xlsx | 5456 | 2021-01-08 21:50:32 |
 g38263g0109062822768.jpg | 2929 | 2021-01-08 21:50:32 |
| MetaLinks.json | 18384 | 2021-01-08 21:50:32 |
| R1.htm | 38621 | 2021-01-08 21:50:32 |
| report.css | 2767 | 2021-01-08 21:50:32 |
| Show.js | 1085 | 2021-01-08 21:50:32 |