Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-244729-index-headers.html | 2020-09-14 08:01:01 | |
| 0001193125-20-244729-index.html | 2020-09-14 08:01:01 | |
| 0001193125-20-244729.txt | 2020-09-14 08:01:01 | |
 0001193125-20-244729-xbrl.zip | 8086 | 2020-09-14 08:01:01 |
| btu-20200908.xsd | 3082 | 2020-09-14 08:01:01 |
| btu-20200908_lab.xml | 17374 | 2020-09-14 08:01:01 |
| btu-20200908_pre.xml | 10962 | 2020-09-14 08:01:01 |
| d63407d8k.htm | 23815 | 2020-09-14 08:01:01 |
| d63407d8k_htm.xml | 3276 | 2020-09-14 08:01:01 |
| FilingSummary.xml | 1691 | 2020-09-14 08:01:01 |
| Financial_Report.xlsx | 5457 | 2020-09-14 08:01:01 |
| MetaLinks.json | 18384 | 2020-09-14 08:01:01 |
| R1.htm | 38621 | 2020-09-14 08:01:01 |
| report.css | 2766 | 2020-09-14 08:01:01 |
| Show.js | 1084 | 2020-09-14 08:01:01 |