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| 0001064728-19-000029.txt | 2019-08-08 06:26:36 | |
 0001064728-19-000029-xbrl.zip | 541868 | 2019-08-08 06:26:36 |
| btu-20190630.xsd | 93125 | 2019-08-08 06:26:36 |
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| btu20190630-10q.htm | 3711942 | 2019-08-08 06:26:36 |
| btu20190630-10q_htm.xml | 3379716 | 2019-08-08 06:26:36 |
| btu20190630ex311.htm | 13919 | 2019-08-08 06:26:36 |
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| btu20190630ex95.htm | 302412 | 2019-08-08 06:26:36 |
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