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| 0001064728-17-000068-index.html | 2017-08-14 07:21:05 | |
| 0001064728-17-000068.txt | 2017-08-14 07:21:05 | |
 0001064728-17-000068-xbrl.zip | 487100 | 2017-08-14 07:21:05 |
| btu-20170630.xml | 3930377 | 2017-08-14 07:21:05 |
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| btu-20170630_lab.xml | 1429556 | 2017-08-14 07:21:05 |
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| btu_2017063010q.htm | 3013099 | 2017-08-14 07:21:05 |
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| FilingSummary.xml | 54669 | 2017-08-14 07:21:05 |
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| report.css | 2768 | 2017-08-14 07:21:05 |
| Show.js | 1411 | 2017-08-14 07:21:05 |