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| 0000012400-15-000006-index.html | 2015-05-07 16:39:17 | |
| 0000012400-15-000006.txt | 2015-05-07 16:39:17 | |
 0000012400-15-000006-xbrl.zip | 85680 | 2015-05-07 16:39:17 |
| bhp10qq12015.htm | 497697 | 2015-05-07 16:39:17 |
| bhpex-311q12015.htm | 15430 | 2015-05-07 16:39:17 |
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| bhpex-32q12015.htm | 62851 | 2015-05-07 16:39:17 |
| bkh-20150331.xml | 481702 | 2015-05-07 16:39:17 |
| bkh-20150331.xsd | 24178 | 2015-05-07 16:39:17 |
| bkh-20150331_cal.xml | 54922 | 2015-05-07 16:39:17 |
| bkh-20150331_def.xml | 81736 | 2015-05-07 16:39:17 |
| bkh-20150331_lab.xml | 327123 | 2015-05-07 16:39:17 |
| bkh-20150331_pre.xml | 164805 | 2015-05-07 16:39:17 |
| FilingSummary.xml | 15097 | 2015-05-07 16:39:17 |
| Financial_Report.xls | 406301 | 2015-05-07 16:39:17 |
| Financial_Report.xlsx | 72818 | 2015-05-07 16:39:17 |
| R1.htm | 29996 | 2015-05-07 16:39:17 |
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| R9.htm | 38609 | 2015-05-07 16:39:17 |
| report.css | 2740 | 2015-05-07 16:39:17 |
| Show.js | 1410 | 2015-05-07 16:39:17 |