Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-22-067145-index-headers.html | 2022-03-07 09:02:20 | |
| 0001193125-22-067145-index.html | 2022-03-07 09:02:20 | |
| 0001193125-22-067145.txt | 2022-03-07 09:02:20 | |
 0001193125-22-067145-xbrl.zip | 179765 | 2022-03-07 09:02:20 |
| btu-20220307.xsd | 2871 | 2022-03-07 09:02:20 |
| btu-20220307_lab.xml | 17235 | 2022-03-07 09:02:20 |
| btu-20220307_pre.xml | 10823 | 2022-03-07 09:02:20 |
| d324900d8k.htm | 41717 | 2022-03-07 09:02:20 |
| d324900d8k_htm.xml | 3270 | 2022-03-07 09:02:20 |
| d324900dex101.htm | 663945 | 2022-03-07 09:02:20 |
| d324900dex11.htm | 201773 | 2022-03-07 09:02:20 |
| d324900dex51.htm | 8088 | 2022-03-07 09:02:20 |
| d324900dex991.htm | 7707 | 2022-03-07 09:02:20 |
| FilingSummary.xml | 1840 | 2022-03-07 09:02:20 |
| Financial_Report.xlsx | 5678 | 2022-03-07 09:02:20 |
 g324900dsp002.jpg | 1409 | 2022-03-07 09:02:20 |
 g324900g0307065204964.jpg | 1814 | 2022-03-07 09:02:20 |
| MetaLinks.json | 17849 | 2022-03-07 09:02:20 |
| R1.htm | 38585 | 2022-03-07 09:02:20 |
| report.css | 2767 | 2022-03-07 09:02:20 |
| Show.js | 1085 | 2022-03-07 09:02:20 |