XML 142 R123.htm IDEA: XBRL DOCUMENT v3.20.4

Income Taxes: CARES Act (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Income Tax Disclosure [Abstract]
Proceeds from Income Tax Refunds	$ 2,400
Amount of Payroll Tax (Social Security Employment Tax) Deferral Allowed Under the CARES Act	$ 10,000

X

- Definition

Amount of Payroll Tax (Social Security Employment Tax) Deferral Allowed Under the CARES Act

+ References

No definition available.

+ Details

Name:	bkh_AmountOfPayrollTaxSocialSecurityEmploymentTaxDeferralAllowedUnderTheCARESAct
Namespace Prefix:	bkh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash received during the period as refunds for the overpayment of taxes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586

+ Details

Name:	us-gaap_ProceedsFromIncomeTaxRefunds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration