Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-030798-index-headers.html | 2021-02-05 16:44:58 | |
| 0001193125-21-030798-index.html | 2021-02-05 16:44:58 | |
| 0001193125-21-030798.txt | 2021-02-05 16:44:58 | |
 0001193125-21-030798-xbrl.zip | 301375 | 2021-02-05 16:44:58 |
| btu-20210203.xsd | 3080 | 2021-02-05 16:44:58 |
| btu-20210203_lab.xml | 17372 | 2021-02-05 16:44:58 |
| btu-20210203_pre.xml | 10960 | 2021-02-05 16:44:58 |
| d19105d8k.htm | 32273 | 2021-02-05 16:44:58 |
| d19105d8k_htm.xml | 3276 | 2021-02-05 16:44:58 |
| d19105dex41.htm | 1071244 | 2021-02-05 16:44:58 |
| d19105dex42.htm | 1001291 | 2021-02-05 16:44:58 |
| FilingSummary.xml | 1757 | 2021-02-05 16:44:58 |
| Financial_Report.xlsx | 5458 | 2021-02-05 16:44:58 |
| MetaLinks.json | 18384 | 2021-02-05 16:44:58 |
| R1.htm | 38621 | 2021-02-05 16:44:58 |
| report.css | 2767 | 2021-02-05 16:44:58 |
| Show.js | 1085 | 2021-02-05 16:44:58 |