$BKH
BLACK HILLS CORP /SD/ Stock $bkh

$bkh Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-Q Financial Statement

#000113046419000043 Filed on November 05, 2019

Income Statement

Concept	2019 Q4	2019 Q3	2018 Q3
Revenue	$477.7M	$325.5M	$322.0M
YoY Change	-4.7%	1.11%	-4.06%
Cost Of Revenue		$73.54M
YoY Change
Gross Profit		$252.0M
YoY Change
Gross Profit Margin		77.41%
Selling, General & Admin	$400.0K	$400.0K
YoY Change
% of Gross Profit		0.16%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$54.60M	$51.88M	$49.05M
YoY Change	9.2%	5.79%	4.11%
% of Gross Profit		20.59%
Operating Expenses	$356.3M	$255.0M	$256.9M
YoY Change	-7.96%	-0.74%	0.33%
Operating Profit	$121.4M	$70.55M	$65.09M
YoY Change	6.34%	8.4%	-18.19%
Interest Expense	-$30.60M	-$33.50M	-$35.30M
YoY Change	-78.3%	-5.1%	3.52%
% of Operating Profit	-25.21%	-47.48%	-54.24%
Other Income/Expense, Net	-$10.40M	-$52.65M	-$35.81M
YoY Change	-109.76%	47.03%	7.91%
Pretax Income	$80.40M	$17.90M	$29.28M
YoY Change	0.88%	-38.85%	-36.87%
Income Tax	$7.500M	$2.500M	$7.500M
% Of Pretax Income	9.33%	13.96%	25.62%
Net Earnings	$69.18M	$11.74M	$16.95M
YoY Change	-20.09%	-30.74%	-46.36%
Net Earnings / Revenue	14.48%	3.61%	5.26%
Basic Earnings Per Share	$1.13	$0.19	$0.32
Diluted Earnings Per Share	$1.13	$0.19	$0.31
COMMON SHARES
Basic Shares Outstanding	61.45M shares	60.98M shares	53.36M shares
Diluted Shares Outstanding		61.10M shares	54.82M shares

Balance Sheet

Concept	2019 Q4	2019 Q3	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$9.800M	$13.10M	$10.00M
YoY Change	-52.88%	31.0%	-25.93%
Cash & Equivalents	$9.777M	$13.09M	$10.00M
Short-Term Investments
Other Short-Term Assets	$26.48M	$29.11M	$32.69M
YoY Change	-11.68%	-10.97%	27.77%
Inventory	$117.2M	$123.0M	$122.6M
Prepaid Expenses
Receivables	$255.8M	$149.0M	$152.8M
Other Receivables	$16.40M	$12.90M	$11.10M
Total Short-Term Assets	$473.2M	$377.4M	$384.9M
YoY Change	-6.08%	-1.95%	-0.03%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.503B	$5.323B	$4.700B
YoY Change	13.35%	13.26%	4.48%
Goodwill	$1.299B	$1.299B	$1.299B
YoY Change	0.0%	0.0%	0.0%
Intangibles	$13.27M	$13.57M	$6.954M
YoY Change	-7.47%	95.08%	-10.44%
Long-Term Investments	$21.90M	$21.60M	$41.20M
YoY Change	-46.59%	-47.57%	219.38%
Other Assets	$41.31M	$25.34M	$17.14M
YoY Change	187.8%	47.81%	47.45%
Total Long-Term Assets	$7.085B	$6.898B	$6.277B
YoY Change	9.69%	9.89%	1.59%
TOTAL ASSETS
Total Short-Term Assets	$473.2M	$377.4M	$384.9M
Total Long-Term Assets	$7.085B	$6.898B	$6.277B
Total Assets	$7.558B	$7.275B	$6.662B
YoY Change	8.55%	9.2%	1.5%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$193.5M	$145.1M	$115.9M
YoY Change	-8.11%	25.18%	22.27%
Accrued Expenses	$226.8M	$217.8M	$201.4M
YoY Change	5.23%	8.18%	-2.62%
Deferred Revenue
YoY Change
Short-Term Debt	$349.5M	$294.9M	$112.1M
YoY Change	88.29%	163.07%	-50.22%
Long-Term Debt Due	$5.743M	$5.743M	$255.7M
YoY Change	0.0%	-97.75%	4353.13%
Total Short-Term Liabilities	$811.3M	$691.1M	$730.2M
YoY Change	25.16%	-5.36%	31.75%
LONG-TERM LIABILITIES
Long-Term Debt	$3.140B	$3.049B	$2.951B
YoY Change	6.41%	3.32%	-5.1%
Other Long-Term Liabilities	$124.7M	$120.8M	$105.9M
YoY Change	13.97%	14.06%	-7.08%
Total Long-Term Liabilities	$3.265B	$3.170B	$1.059B
YoY Change	203.18%	199.3%	-4.03%
TOTAL LIABILITIES
Total Short-Term Liabilities	$811.3M	$691.1M	$730.2M
Total Long-Term Liabilities	$3.265B	$3.170B	$1.059B
Total Liabilities	$4.076B	$3.861B	$1.789B
YoY Change	136.28%	115.78%	7.93%
SHAREHOLDERS EQUITY
Retained Earnings	$778.8M	$742.1M	$644.2M
YoY Change	11.19%	15.21%	24.75%
Common Stock	$61.48M	$61.48M	$53.66M
YoY Change	2.38%	14.57%	0.26%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$267.0K	$1.636M	$4.072M
YoY Change	-89.36%	-59.82%	66.34%
Treasury Stock Shares	3.956K shares	26.57K shares	72.92K shares
Shareholders Equity	$2.362B	$2.329B	$1.813B
YoY Change
Total Liabilities & Shareholders Equity	$7.558B	$7.275B	$6.662B
YoY Change	8.55%	9.2%	1.5%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2018 Q3
OPERATING ACTIVITIES
Net Income	$69.18M	$11.74M	$16.95M
YoY Change	-20.09%	-30.74%	-46.36%
Depreciation, Depletion And Amortization	$54.60M	$51.88M	$49.05M
YoY Change	9.2%	5.79%	4.11%
Cash From Operating Activities	$119.4M	$96.30M	$68.00M
YoY Change	8.45%	41.62%	20.35%
INVESTING ACTIVITIES
Capital Expenditures	-$225.9M	-$274.8M	-$121.4M
YoY Change	25.92%	126.36%	43.67%
Acquisitions
YoY Change
Other Investing Activities	$2.900M	-$1.100M	$3.200M
YoY Change	-161.7%	-134.38%	-140.51%
Cash From Investing Activities	-$222.9M	-$276.0M	-$118.3M
YoY Change	21.14%	133.31%	27.89%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	100.4M	186.2M	51.80M
YoY Change	18.4%	259.46%	36.32%
NET CHANGE
Cash From Operating Activities	119.4M	96.30M	68.00M
Cash From Investing Activities	-222.9M	-276.0M	-118.3M
Cash From Financing Activities	100.4M	186.2M	51.80M
Net Change In Cash	-3.100M	6.500M	1.500M
YoY Change	-128.44%	333.33%	-25.0%
FREE CASH FLOW
Cash From Operating Activities	$119.4M	$96.30M	$68.00M
Capital Expenditures	-$225.9M	-$274.8M	-$121.4M
Free Cash Flow	$345.3M	$371.1M	$189.4M
YoY Change	19.27%	95.93%	34.33%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Entity Central Index Key EntityCentralIndexKey	0001130464
CY2018Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.475
CY2018Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.475
CY2018Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.475
CY2019Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.505
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.505
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.505
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	60048567	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	61480640	shares
CY2018Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-10000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-29000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-3000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-13000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	138000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	409000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	92000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	197000	USD
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	44253	shares
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	26572	shares
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
	dei	Entity Shell Company EntityShellCompany	false
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-31303
	dei	Entity Registrant Name EntityRegistrantName	Black Hills Corporation
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	SD
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	46-0458824
	dei	Entity Address Address Line1 EntityAddressAddressLine1	7001 Mount Rushmore Road
	dei	Entity Address City Or Town EntityAddressCityOrTown	Rapid City
	dei	Entity Address State Or Province EntityAddressStateOrProvince	SD
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	57702
	dei	City Area Code CityAreaCode	(605)
	dei	Local Phone Number LocalPhoneNumber	721-1700
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Security12b Title Security12bTitle	Common stock of $1.00 par value
	dei	Trading Symbol TradingSymbol	BKH
	dei	Security Exchange Name SecurityExchangeName	NYSE
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	us-gaap	Revenues Revenues	1257246000	USD
	us-gaap	Revenues Revenues	1253072000	USD
CY2019Q3	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	73090000	USD
CY2018Q3	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	80244000	USD
	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	411695000	USD
	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	432544000	USD
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	bkh	Operating Expense Maintenance Operationsand Other Costsand Expense OperatingExpenseMaintenanceOperationsandOtherCostsandExpense	366907000	USD
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	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	154507000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	146345000	USD
CY2019Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	12986000	USD
CY2018Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	11905000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	39454000	USD
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	us-gaap	Operating Expenses OperatingExpenses	972563000	USD
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CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	70551000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	65085000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	284683000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	282910000	USD
	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	1345000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-5627000	USD
CY2018Q3	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	701000	USD
	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	4555000	USD
CY2019Q3	us-gaap	Interest Costs Incurred InterestCostsIncurred	36200000	USD
CY2018Q3	us-gaap	Interest Costs Incurred InterestCostsIncurred	36380000	USD
	us-gaap	Interest Costs Incurred InterestCostsIncurred	108232000	USD
	us-gaap	Interest Costs Incurred InterestCostsIncurred	107183000	USD
CY2019Q3	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	2200000	USD
CY2019Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	513000	USD
CY2018Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	382000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	1208000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	1012000	USD
CY2019Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	311000	USD
CY2018Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	193000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	486000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	503000	USD
CY2019Q3	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	19741000	USD
CY2018Q3	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	19741000	USD
	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	269000	USD
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	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-431000	USD
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	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-106749000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	17903000	USD
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CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2508000	USD
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	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22078000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-11784000	USD
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	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	140450000	USD
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CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
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	us-gaap	Profit Loss ProfitLoss	140450000	USD
	us-gaap	Profit Loss ProfitLoss	182318000	USD
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	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	10319000	USD
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	us-gaap	Net Income Loss NetIncomeLoss	130131000	USD
	us-gaap	Net Income Loss NetIncomeLoss	171871000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	11740000	USD
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	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	130131000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	177498000	USD
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
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CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	16950000	USD
	us-gaap	Net Income Loss NetIncomeLoss	130131000	USD
	us-gaap	Net Income Loss NetIncomeLoss	171871000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.19
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	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.15
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.33
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2018Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.02
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.10
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.15
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.22
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.19
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.32
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.15
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.26
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.02
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.10
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.15
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.15
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60976000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53364000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60458000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53346000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	61104000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54819000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	60578000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54508000	shares
CY2019Q3	us-gaap	Profit Loss ProfitLoss	15395000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	20944000	USD
	us-gaap	Profit Loss ProfitLoss	140450000	USD
	us-gaap	Profit Loss ProfitLoss	182318000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-16000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-34000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-45000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-104000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	9000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-483000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-327000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-1456000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	532000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1060000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1221000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3481000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	15927000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	22004000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	141671000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	185799000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3655000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3994000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	10319000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	10447000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	12272000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18010000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	131352000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	175352000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13087000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	20776000	USD
CY2019Q3	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	3688000	USD
CY2018Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	3369000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	148989000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	269153000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	123002000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	117299000	USD
CY2019Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	412000	USD
CY2018Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	1500000	USD
CY2019Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12931000	USD
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12978000	USD
CY2019Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	46206000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	48776000	USD
CY2019Q3	us-gaap	Other Assets Current OtherAssetsCurrent	29106000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	29982000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	377421000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	503833000	USD
CY2019Q3	us-gaap	Long Term Investments LongTermInvestments	21583000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	41013000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	6567229000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	6000015000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1243794000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1145136000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5323435000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4854879000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	1299454000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1299454000	USD
CY2019Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	13566000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	14337000	USD
CY2019Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	214152000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	235459000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	25339000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	14352000	USD
CY2019Q3	us-gaap	Assets Noncurrent Other Than Noncurrent Investments And Property Plant And Equipment AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment	1552511000	USD
CY2018Q4	us-gaap	Assets Noncurrent Other Than Noncurrent Investments And Property Plant And Equipment AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment	1563602000	USD
CY2019Q3	us-gaap	Assets Assets	7274950000	USD
CY2018Q4	us-gaap	Assets Assets	6963327000	USD
CY2019Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	145085000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	210609000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	217832000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	215501000	USD
CY2019Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	2396000	USD
CY2018Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	947000	USD
CY2019Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	25168000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	29810000	USD
CY2019Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	294900000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	185620000	USD
CY2019Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	5743000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	5743000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	691124000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	648230000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3049235000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2950835000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	347952000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	311331000	USD
CY2019Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	498773000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	510984000	USD
CY2019Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	134150000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	145147000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	120820000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	109377000	USD
CY2019Q3	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1101695000	USD
CY2018Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1076839000	USD
CY2019Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	61481000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	60049000	USD
CY2019Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1553190000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1450569000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	742138000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	700396000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	1636000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2510000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-25695000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-26916000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	2329478000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	2181588000	USD
CY2019Q3	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	103418000	USD
CY2018Q4	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	105835000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2432896000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2287423000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7274950000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6963327000	USD
	us-gaap	Profit Loss ProfitLoss	140450000	USD
	us-gaap	Profit Loss ProfitLoss	182318000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-5627000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	140450000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	187945000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	154507000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	146345000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	6326000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5682000	USD
	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	19741000	USD
	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	8332000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7544000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	24381000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-14396000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	7965000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	10641000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-9192000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7668000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4126000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	8380000	USD
	us-gaap	Increase Decrease In Accounts Receivable And Other Operating Assets IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets	-115325000	USD
	us-gaap	Increase Decrease In Accounts Receivable And Other Operating Assets IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets	-72061000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-83436000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-86604000	USD
	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	-12455000	USD
	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	-41655000	USD
	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-15644000	USD
	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	21416000	USD
	us-gaap	Pension Contributions PensionContributions	12700000	USD
	us-gaap	Pension Contributions PensionContributions	12700000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-3307000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2007000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	386075000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	380884000	USD
	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	0	USD
	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-2162000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	386075000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	378722000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	592537000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	278132000	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	0	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	24429000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	735000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2766000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-593272000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-299795000	USD
	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0	USD
	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	18024000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-593272000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-281771000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	91779000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	76309000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	101361000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1079000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	109280000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-99200000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	400000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	700000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	304307000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	603307000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	12736000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	13755000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1992000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10457000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	199827000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-101949000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-7370000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-4998000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	24145000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18240000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	16775000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13242000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2287423000	USD
CY2019Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	30332000	USD
CY2019Q1	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	107362000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	457000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	538000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	19999000	USD
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	289000	USD
CY2019Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3390000	USD
CY2019Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4846000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2383702000	USD
CY2019Q2	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	17693000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	232000	USD
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	30620000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3890000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	50001000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	492000	USD
CY2019Q2	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	-3000	USD
CY2019Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4405000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2419998000	USD
CY2019Q3	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	15395000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	532000	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	30827000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1677000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	30001000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	398000	USD
CY2019Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3000	USD
CY2019Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	3485000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2432896000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1820206000	USD
CY2018Q1	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	136634000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1260000	USD
CY2018Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	25444000	USD
CY2018Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	755000	USD
CY2018Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	219000	USD
CY2018Q1	us-gaap	Stockholders Equity Other StockholdersEquityOther	-2000	USD
CY2018Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5648000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1927984000	USD
CY2018Q2	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	24740000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1161000	USD
CY2018Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	25435000	USD
CY2018Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2439000	USD
CY2018Q2	us-gaap	Stockholders Equity Other StockholdersEquityOther	6000	USD
CY2018Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4350000	USD
CY2018Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1926533000	USD
CY2018Q3	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	20944000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1060000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	25430000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1677000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1000	USD
CY2018Q3	us-gaap	Stockholders Equity Other StockholdersEquityOther	-151000	USD
CY2018Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	3757000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1921179000	USD
	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates and Basis of Presentation</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The information furnished in the accompanying Condensed Consolidated Financial Statements reflects certain estimates required and all adjustments, including accruals, which are, in the opinion of management, necessary for a fair presentation of the </span><span style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">September 30, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">December 31, 2018</span><span style="font-family:inherit;font-size:10pt;"> financial information. Certain industries in which we operate are highly seasonal, and revenue from, and certain expenses for, such operations may fluctuate significantly among quarterly periods. Demand for electricity and natural gas is sensitive to seasonal cooling, heating and industrial load requirements. In particular, the normal peak usage season for electric utilities is June through August while the normal peak usage season for gas utilities is November through March. Significant earnings variances can be expected between the Gas Utilities segment’s peak and off-peak seasons. Due to this seasonal nature, our results of operations for the </span><span style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">three</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">nine</span><span style="font-family:inherit;font-size:10pt;"> months ended </span><span style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">September 30, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">September 30, 2018</span><span style="font-family:inherit;font-size:10pt;">, and our financial condition as of </span><span style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">September 30, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">December 31, 2018</span><span style="font-family:inherit;font-size:10pt;"> are not necessarily indicative of the results of operations and financial condition to be expected for any other period. All earnings per share amounts discussed refer to diluted earnings per share unless otherwise noted.</span></div>
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	323745000	USD
CY2019Q3	us-gaap	Revenues Revenues	325548000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	323745000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	320163000	USD
CY2018Q3	us-gaap	Revenues Revenues	321979000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	320163000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1251461000	USD
	us-gaap	Revenues Revenues	1257246000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1251461000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1245981000	USD
	us-gaap	Revenues Revenues	1253072000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1245981000	USD
CY2019Q3	us-gaap	Revenues Revenues	325548000	USD
CY2018Q3	us-gaap	Revenues Revenues	321979000	USD
	us-gaap	Revenues Revenues	1257246000	USD
	us-gaap	Revenues Revenues	1253072000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	70551000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	65085000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	284683000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	282910000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-33487000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-35297000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-102469000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-104826000	USD
CY2019Q3	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	19741000	USD
CY2018Q3	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	19741000	USD
	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2019Q3	bkh	Other Nonoperating Income Expense Including Allowance For Funds Used During Construction Equity OtherNonoperatingIncomeExpenseIncludingAllowanceForFundsUsedDuringConstructionEquity	580000	USD
CY2018Q3	bkh	Other Nonoperating Income Expense Including Allowance For Funds Used During Construction Equity OtherNonoperatingIncomeExpenseIncludingAllowanceForFundsUsedDuringConstructionEquity	-510000	USD
	bkh	Other Nonoperating Income Expense Including Allowance For Funds Used During Construction Equity OtherNonoperatingIncomeExpenseIncludingAllowanceForFundsUsedDuringConstructionEquity	55000	USD
	bkh	Other Nonoperating Income Expense Including Allowance For Funds Used During Construction Equity OtherNonoperatingIncomeExpenseIncludingAllowanceForFundsUsedDuringConstructionEquity	-1923000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2508000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7477000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22078000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-11784000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	15395000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	21801000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	140450000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	187945000	USD
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-857000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-5627000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	15395000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	20944000	USD
	us-gaap	Profit Loss ProfitLoss	140450000	USD
	us-gaap	Profit Loss ProfitLoss	182318000	USD
CY2019Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3655000	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3994000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	10319000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	10447000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	11740000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16950000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	130131000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	171871000	USD
CY2018Q3	bkh	Changes To Our Segment Performance Measure Operating Income ChangesToOurSegmentPerformanceMeasureOperatingIncome	0	USD
	bkh	Changes To Our Segment Performance Measure Operating Income ChangesToOurSegmentPerformanceMeasureOperatingIncome	0	USD
CY2019Q3	us-gaap	Assets Assets	7274950000	USD
CY2018Q4	us-gaap	Assets Assets	6963327000	USD
CY2019Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	96214000	USD
CY2019Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	55934000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3159000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	148989000	USD
CY2018Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	146716000	USD
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	125646000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3209000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	269153000	USD
CY2019Q3	us-gaap	Regulatory Assets RegulatoryAssets	260358000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	284235000	USD
CY2019Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	46206000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	48776000	USD
CY2019Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	214152000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	235459000	USD
CY2019Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	523941000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	540794000	USD
CY2019Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	25168000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	29810000	USD
CY2019Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	498773000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	510984000	USD
CY2019Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	81382000	USD
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	75081000	USD
CY2019Q3	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	2535000	USD
CY2018Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	2850000	USD
CY2019Q3	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	39085000	USD
CY2018Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	39368000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	123002000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	117299000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	11740000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	16950000	USD
	us-gaap	Net Income Loss NetIncomeLoss	130131000	USD
	us-gaap	Net Income Loss NetIncomeLoss	171871000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60976000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53364000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60458000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53346000	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	0	shares
CY2018Q3	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	1344000	shares
	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	0	shares
	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	1060000	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	128000	shares
CY2018Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	111000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	120000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	102000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	61104000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54819000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	60578000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54508000	shares
CY2019Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2000	shares
CY2018Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	12000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	15000	shares
CY2019Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	294900000	USD
CY2019Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	18313000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	185620000	USD
CY2018Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	22311000	USD
CY2019Q3	bkh	Commercial Paper Maximum Borrowing Capacity CommercialPaperMaximumBorrowingCapacity	750000000	USD
CY2019Q3	bkh	Commercial Paper Maximum Borrowing Capacity CommercialPaperMaximumBorrowingCapacity	750000000	USD
CY2017Q3	bkh	At The Market Equity Offering Program Authorized Aggregate Value AtTheMarketEquityOfferingProgramAuthorizedAggregateValue	300000000	USD
CY2019Q3	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	300000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	1000000.0	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-26916000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-25695000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-41202000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-37703000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	86661000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	49631000	USD
	us-gaap	Interest Paid Net InterestPaidNet	99375000	USD
	us-gaap	Interest Paid Net InterestPaidNet	104035000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-2255000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	14842000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2500000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7500000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-5300000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.140
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.076
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12000000	USD
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-7500000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.136
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.171
	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	5000000.0	USD
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	1000000.0	USD
CY2019Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	57313000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	63742000	USD
CY2019Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	38937000	USD
CY2018Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	42510000	USD
CY2019Q3	bkh	Customer Depositsand Prepayments CustomerDepositsandPrepayments	56220000	USD
CY2018Q4	bkh	Customer Depositsand Prepayments CustomerDepositsandPrepayments	43574000	USD
CY2019Q3	us-gaap	Interest Payable Current InterestPayableCurrent	35100000	USD
CY2018Q4	us-gaap	Interest Payable Current InterestPayableCurrent	31759000	USD
CY2019Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	30262000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	33916000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	217832000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	215501000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	380000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1076000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	28000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	72000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	14000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	413000	USD
	us-gaap	Lease Cost LeaseCost	1162000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4864000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	493000	USD
CY2019Q3	bkh	Operatingand Finance Lease Assets OperatingandFinanceLeaseAssets	5357000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	970000	USD
CY2019Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	80000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	4252000	USD
CY2019Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	419000	USD
CY2019Q3	bkh	Operatingand Finance Lease Liabilities OperatingandFinanceLeaseLiabilities	5721000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	895000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	14000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	66000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2775000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	67000	USD
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y
CY2019Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0427
CY2019Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0419
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	368000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	32000	USD
CY2019Q3	bkh	Lease Liability Payments Remainderof Fiscal Year LeaseLiabilityPaymentsRemainderofFiscalYear	400000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	992000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	126000	USD
CY2019Q3	bkh	Lease Liability Payments Due Year Two LeaseLiabilityPaymentsDueYearTwo	1118000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	855000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	126000	USD
CY2019Q3	bkh	Lease Liability Payments Due Year Three LeaseLiabilityPaymentsDueYearThree	981000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	736000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	126000	USD
CY2019Q3	bkh	Lease Liability Payments Due Year Four LeaseLiabilityPaymentsDueYearFour	862000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	714000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	126000	USD
CY2019Q3	bkh	Lease Liability Payments Due Year Five LeaseLiabilityPaymentsDueYearFive	840000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	2682000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	10000	USD
CY2019Q3	bkh	Lease Liability Payments After Year Five LeaseLiabilityPaymentsAfterYearFive	2692000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	6347000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	546000	USD
CY2019Q3	bkh	Lease Liability Payments Due LeaseLiabilityPaymentsDue	6893000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1125000	USD
CY2019Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	47000	USD
CY2019Q3	bkh	Lease Liability Undiscounted Excess Amount LeaseLiabilityUndiscountedExcessAmount	1172000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	5222000	USD
CY2019Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	499000	USD
CY2019Q3	bkh	Lease Liability LeaseLiability	5721000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	1052000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	464000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	344000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	224000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	216000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1776000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	4076000	USD
CY2019Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	544000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	1749000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	551000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	2035000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	1857000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	1793000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	1799000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	55481000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	63516000	USD
CY2018Q1	bkh	Assets Held For Sale Usedto Acquire Other Investments AssetsHeldForSaleUsedtoAcquireOtherInvestments	28000000	USD
	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	20000000	USD
CY2019Q3	us-gaap	Long Term Investments LongTermInvestments	21583000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	41013000	USD

Files In Submission

Name	View Source	Status
0001130464-19-000043-index-headers.html	Edgar Link	pending
0001130464-19-000043-index.html	Edgar Link	pending
0001130464-19-000043.txt	Edgar Link	pending
0001130464-19-000043-xbrl.zip	Edgar Link	pending
bkh-20190930.xsd	Edgar Link	pending
bkh-20190930_cal.xml	Edgar Link	unprocessable
bkh-20190930_def.xml	Edgar Link	unprocessable
bkh-20190930_lab.xml	Edgar Link	unprocessable
bkh-20190930_pre.xml	Edgar Link	unprocessable
bkh10qq32019.htm	Edgar Link	pending
bkh10qq32019_htm.xml	Edgar Link	completed
bkhex-311q32019.htm	Edgar Link	pending
bkhex-312q32019.htm	Edgar Link	pending
bkhex-321q32019.htm	Edgar Link	pending
bkhex-322q32019.htm	Edgar Link	pending
bkhex-95q32019.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$BKH
BLACK HILLS CORP /SD/ Stock $bkh

2019 Q4 Form 10-Q Financial Statement

#000113046419000043 Filed on November 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH BLACK HILLS CORP /SD/ Stock $bkh

2019 Q4 Form 10-Q Financial Statement

#000113046419000043 Filed on November 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH
BLACK HILLS CORP /SD/ Stock $bkh