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|---|---|---|
 0001130464-20-000031-index-headers.html | 2020-08-03 17:44:27 | |
| 0001130464-20-000031-index.html | 2020-08-03 17:44:27 | |
| 0001130464-20-000031.txt | 2020-08-03 17:44:27 | |
 0001130464-20-000031-xbrl.zip | 42417 | 2020-08-03 17:44:27 |
 bhcreadyorangeblacka011.jpg | 33146 | 2020-08-03 17:44:27 |
| bkh-20200803.htm | 38943 | 2020-08-03 17:44:27 |
| bkh-20200803.xsd | 2831 | 2020-08-03 17:44:27 |
| bkh-20200803_cal.xml | 874 | 2020-08-03 17:44:27 |
| bkh-20200803_def.xml | 1858 | 2020-08-03 17:44:27 |
| bkh-20200803_htm.xml | 10580 | 2020-08-03 17:44:27 |
| bkh-20200803_lab.xml | 24572 | 2020-08-03 17:44:27 |
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| ex-99q22020earningsrel.htm | 742795 | 2020-08-03 17:44:27 |
| FilingSummary.xml | 1886 | 2020-08-03 17:44:27 |
| Financial_Report.xlsx | 5460 | 2020-08-03 17:44:27 |
| MetaLinks.json | 18710 | 2020-08-03 17:44:27 |
| R1.htm | 38689 | 2020-08-03 17:44:27 |
| report.css | 2767 | 2020-08-03 17:44:27 |
| Show.js | 1085 | 2020-08-03 17:44:27 |