Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-257609-index-headers.html | 2020-09-29 14:10:02 | |
| 0001193125-20-257609-index.html | 2020-09-29 14:10:02 | |
| 0001193125-20-257609.txt | 2020-09-29 14:10:02 | |
 0001193125-20-257609-xbrl.zip | 9286 | 2020-09-29 14:10:02 |
| btu-20200929.xsd | 3081 | 2020-09-29 14:10:02 |
| btu-20200929_lab.xml | 17373 | 2020-09-29 14:10:02 |
| btu-20200929_pre.xml | 10961 | 2020-09-29 14:10:02 |
| d65564d8k.htm | 25423 | 2020-09-29 14:10:02 |
| d65564d8k_htm.xml | 3276 | 2020-09-29 14:10:02 |
| d65564dex991.htm | 3008 | 2020-09-29 14:10:02 |
| FilingSummary.xml | 1725 | 2020-09-29 14:10:02 |
| Financial_Report.xlsx | 5456 | 2020-09-29 14:10:02 |
 g65564g0929214319950.jpg | 3080 | 2020-09-29 14:10:02 |
| MetaLinks.json | 18384 | 2020-09-29 14:10:02 |
| R1.htm | 38620 | 2020-09-29 14:10:02 |
| report.css | 2767 | 2020-09-29 14:10:02 |
| Show.js | 1085 | 2020-09-29 14:10:02 |