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 0001130464-20-000021-index-headers.html | 2020-05-04 16:35:41 | |
| 0001130464-20-000021-index.html | 2020-05-04 16:35:41 | |
| 0001130464-20-000021.txt | 2020-05-04 16:35:41 | |
 0001130464-20-000021-xbrl.zip | 34633 | 2020-05-04 16:35:41 |
| a8-kq12020earningsrele.htm | 41933 | 2020-05-04 16:35:41 |
| a8-kq12020earningsrele_htm.xml | 4600 | 2020-05-04 16:35:41 |
 bhcreadyorangeblack.jpg | 33146 | 2020-05-04 16:35:41 |
| bkh-20200504.xsd | 4841 | 2020-05-04 16:35:41 |
| bkh-20200504_cal.xml | 772 | 2020-05-04 16:35:41 |
| bkh-20200504_def.xml | 1622 | 2020-05-04 16:35:41 |
| bkh-20200504_lab.xml | 26448 | 2020-05-04 16:35:41 |
| bkh-20200504_pre.xml | 13792 | 2020-05-04 16:35:41 |
| ex-99q12020earningsrel.htm | 392892 | 2020-05-04 16:35:41 |
| FilingSummary.xml | 1916 | 2020-05-04 16:35:41 |
| Financial_Report.xlsx | 5798 | 2020-05-04 16:35:41 |
| MetaLinks.json | 19712 | 2020-05-04 16:35:41 |
| R1.htm | 38682 | 2020-05-04 16:35:41 |
| report.css | 2767 | 2020-05-04 16:35:41 |
| Show.js | 1085 | 2020-05-04 16:35:41 |