Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-025061-index-headers.html | 2020-02-05 10:52:00 | |
| 0001193125-20-025061-index.html | 2020-02-05 10:52:00 | |
| 0001193125-20-025061.txt | 2020-02-05 10:52:00 | |
 0001193125-20-025061-xbrl.zip | 32998 | 2020-02-05 10:52:00 |
| btu-20200204.xsd | 3081 | 2020-02-05 10:52:00 |
| btu-20200204_lab.xml | 17373 | 2020-02-05 10:52:00 |
| btu-20200204_pre.xml | 10961 | 2020-02-05 10:52:00 |
| d800147d8k.htm | 38125 | 2020-02-05 10:52:00 |
| d800147d8k_htm.xml | 3275 | 2020-02-05 10:52:00 |
| d800147dex101.htm | 89789 | 2020-02-05 10:52:00 |
| d800147dex991.htm | 13154 | 2020-02-05 10:52:00 |
| FilingSummary.xml | 1769 | 2020-02-05 10:52:00 |
| Financial_Report.xlsx | 5795 | 2020-02-05 10:52:00 |
 g800147img1.jpg | 11652 | 2020-02-05 10:52:00 |
| MetaLinks.json | 18330 | 2020-02-05 10:52:00 |
| R1.htm | 38621 | 2020-02-05 10:52:00 |
| report.css | 2767 | 2020-02-05 10:52:00 |
| Show.js | 1084 | 2020-02-05 10:52:00 |