Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-19-272625-index-headers.html | 2019-10-23 16:37:00 | |
| 0001193125-19-272625-index.html | 2019-10-23 16:37:00 | |
| 0001193125-19-272625.txt | 2019-10-23 16:37:00 | |
 0001193125-19-272625-xbrl.zip | 10448 | 2019-10-23 16:37:00 |
| btu-20191016.xsd | 3084 | 2019-10-23 16:37:00 |
| btu-20191016_lab.xml | 17376 | 2019-10-23 16:37:00 |
| btu-20191016_pre.xml | 10964 | 2019-10-23 16:37:00 |
| d823131d8ka.htm | 29208 | 2019-10-23 16:37:00 |
| d823131d8ka_htm.xml | 3278 | 2019-10-23 16:37:00 |
| d823131dex991.htm | 5176 | 2019-10-23 16:37:00 |
| FilingSummary.xml | 1734 | 2019-10-23 16:37:00 |
| Financial_Report.xlsx | 5788 | 2019-10-23 16:37:00 |
 g823131g1023185709722.jpg | 3080 | 2019-10-23 16:37:00 |
| MetaLinks.json | 18364 | 2019-10-23 16:37:00 |
| R1.htm | 38618 | 2019-10-23 16:37:00 |
| report.css | 2767 | 2019-10-23 16:37:00 |
| Show.js | 1085 | 2019-10-23 16:37:00 |