$BKH
BLACK HILLS CORP /SD/ Stock $bkh

$bkh Overview Financials Valuation SEC Filings Company Website

2018 Q2 Form 10-Q Financial Statement

#000113046418000044 Filed on August 07, 2018

Income Statement

Concept	2018 Q2	2017 Q2
Revenue	$355.7M	$341.8M
YoY Change	4.06%	7.56%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$48.71M	$46.83M
YoY Change	4.02%	-1.01%
% of Gross Profit
Operating Expenses	$286.2M	$272.0M
YoY Change	5.19%	-6.24%
Operating Profit	$69.55M	$69.80M
YoY Change	-0.35%	9.53%
Interest Expense	-$34.50M	-$33.90M
YoY Change	1.77%	3.99%
% of Operating Profit	-49.6%	-48.57%
Other Income/Expense, Net	-$35.84M	-$33.22M
YoY Change	7.91%	70574.47%
Pretax Income	$33.71M	$36.58M
YoY Change	-7.85%	918.35%
Income Tax	$6.500M	$10.65M
% Of Pretax Income	19.28%	29.12%
Net Earnings	$21.92M	$25.31M
YoY Change	-13.41%	670.97%
Net Earnings / Revenue	6.16%	7.4%
Basic Earnings Per Share	$0.41	$0.42
Diluted Earnings Per Share	$0.40	$0.40
COMMON SHARES
Basic Shares Outstanding	53.36M shares	53.23M shares
Diluted Shares Outstanding	54.52M shares	55.38M shares

Balance Sheet

Concept	2018 Q2	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$8.600M	$11.60M
YoY Change	-25.86%	-90.07%
Cash & Equivalents	$8.630M	$11.53M
Short-Term Investments
Other Short-Term Assets	$31.43M	$20.77M
YoY Change	51.34%	-32.25%
Inventory	$95.45M	$95.49M
Prepaid Expenses
Receivables	$175.6M	$166.8M
Other Receivables	$11.70M	$0.00
Total Short-Term Assets	$380.7M	$359.3M
YoY Change	5.96%	-7.6%
LONG-TERM ASSETS
Property, Plant & Equipment	$4.614B	$4.459B
YoY Change	3.49%	1.56%
Goodwill	$1.299B	$1.299B
YoY Change	0.0%	-0.31%
Intangibles	$7.155M	$7.972M
YoY Change	-10.25%	-13.01%
Long-Term Investments	$41.10M	$12.80M
YoY Change	221.09%	3.23%
Other Assets	$17.21M	$13.59M
YoY Change	26.58%	-11.94%
Total Long-Term Assets	$6.189B	$1.565B
YoY Change	295.4%	1.07%
TOTAL ASSETS
Total Short-Term Assets	$380.7M	$359.3M
Total Long-Term Assets	$6.189B	$1.565B
Total Assets	$6.570B	$6.510B
YoY Change	0.93%	2.68%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$104.7M	$99.30M
YoY Change	5.46%	-13.81%
Accrued Expenses	$190.3M	$191.8M
YoY Change	-0.76%	-12.12%
Deferred Revenue
YoY Change
Short-Term Debt	$121.8M	$108.0M
YoY Change	12.8%	43.97%
Long-Term Debt Due	$255.7M	$5.743M
YoY Change	4353.13%	-99.38%
Total Short-Term Liabilities	$730.6M	$438.9M
YoY Change	66.48%	-68.94%
LONG-TERM LIABILITIES
Long-Term Debt	$2.858B	$3.160B
YoY Change	-9.56%	42.27%
Other Long-Term Liabilities	$105.0M	$112.6M
YoY Change	-6.75%	-7.76%
Total Long-Term Liabilities	$1.055B	$1.121B
YoY Change	-5.86%	9.7%
TOTAL LIABILITIES
Total Short-Term Liabilities	$730.6M	$438.9M
Total Long-Term Liabilities	$1.055B	$1.121B
Total Liabilities	$1.786B	$1.559B
YoY Change	14.5%	-35.94%
SHAREHOLDERS EQUITY
Retained Earnings	$652.6M	$512.5M
YoY Change	27.35%	9.06%
Common Stock	$53.66M	$53.51M
YoY Change	0.28%	2.32%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$3.642M	$2.325M
YoY Change	56.65%	138.46%
Treasury Stock Shares	64.98K shares	39.33K shares
Shareholders Equity	$1.819B	$1.676B
YoY Change
Total Liabilities & Shareholders Equity	$6.570B	$6.510B
YoY Change	0.93%	2.68%

Cashflow Statement

Concept	2018 Q2	2017 Q2
OPERATING ACTIVITIES
Net Income	$21.92M	$25.31M
YoY Change	-13.41%	670.97%
Depreciation, Depletion And Amortization	$48.71M	$46.83M
YoY Change	4.02%	-1.01%
Cash From Operating Activities	$140.8M	$116.1M
YoY Change	21.27%	29.43%
INVESTING ACTIVITIES
Capital Expenditures	-$86.70M	-$87.80M
YoY Change	-1.25%	-24.31%
Acquisitions
YoY Change
Other Investing Activities	-$3.200M	-$6.300M
YoY Change	-49.21%	-181.82%
Cash From Investing Activities	-$89.90M	-$94.10M
YoY Change	-4.46%	-13.03%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-73.00M	-21.50M
YoY Change	239.53%	-122.97%
NET CHANGE
Cash From Operating Activities	140.8M	116.1M
Cash From Investing Activities	-89.90M	-94.10M
Cash From Financing Activities	-73.00M	-21.50M
Net Change In Cash	-22.10M	500.0K
YoY Change	-4520.0%	-99.33%
FREE CASH FLOW
Cash From Operating Activities	$140.8M	$116.1M
Capital Expenditures	-$86.70M	-$87.80M
Free Cash Flow	$227.5M	$203.9M
YoY Change	11.57%	-0.88%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2017Q3	bkh	At The Market Equity Offering Program Authorized Aggregate Value AtTheMarketEquityOfferingProgramAuthorizedAggregateValue	300000000	USD
CY2018Q2	bkh	Commercial Paper Maximum Borrowing Capacity CommercialPaperMaximumBorrowingCapacity	750000000	USD
CY2017Q2	bkh	Disposal Group Including Discontinued Operation Derivative Assets Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrentandNoncurrent	541000	USD
CY2017Q4	bkh	Disposal Group Including Discontinued Operation Derivative Assets Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrentandNoncurrent	0	USD
CY2018Q2	bkh	Disposal Group Including Discontinued Operation Derivative Assets Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrentandNoncurrent	0	USD
CY2017Q2	bkh	Disposal Group Including Discontinued Operation Gain Loss On Sale Of Assets DisposalGroupIncludingDiscontinuedOperationGainLossOnSaleOfAssets	-249000	USD
	bkh	Disposal Group Including Discontinued Operation Gain Loss On Sale Of Assets DisposalGroupIncludingDiscontinuedOperationGainLossOnSaleOfAssets	-249000	USD
CY2018Q2	bkh	Disposal Group Including Discontinued Operation Gain Loss On Sale Of Assets DisposalGroupIncludingDiscontinuedOperationGainLossOnSaleOfAssets	1991000	USD
	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
	bkh	Disposal Group Including Discontinued Operation Gain Loss On Sale Of Assets DisposalGroupIncludingDiscontinuedOperationGainLossOnSaleOfAssets	2203000	USD
	bkh	Disposal Group Including Discontinued Operation Gain Loss On Sale Of Assets DisposalGroupIncludingDiscontinuedOperationGainLossOnSaleOfAssets	2200000	USD
CY2017Q2	bkh	Disposal Group Including Discontinued Operations Derivative Liabilities Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationsDerivativeLiabilitiesCurrentandNoncurrent	44000	USD
CY2017Q4	bkh	Disposal Group Including Discontinued Operations Derivative Liabilities Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationsDerivativeLiabilitiesCurrentandNoncurrent	0	USD
CY2018Q2	bkh	Disposal Group Including Discontinued Operations Derivative Liabilities Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationsDerivativeLiabilitiesCurrentandNoncurrent	0	USD
CY2017Q2	bkh	Disposal Group Including Discontinued Operations Other Income Expensenet DisposalGroupIncludingDiscontinuedOperationsOtherIncomeExpensenet	65000	USD
	bkh	Disposal Group Including Discontinued Operations Other Income Expensenet DisposalGroupIncludingDiscontinuedOperationsOtherIncomeExpensenet	138000	USD
CY2018Q2	bkh	Disposal Group Including Discontinued Operations Other Income Expensenet DisposalGroupIncludingDiscontinuedOperationsOtherIncomeExpensenet	90000	USD
	bkh	Disposal Group Including Discontinued Operations Other Income Expensenet DisposalGroupIncludingDiscontinuedOperationsOtherIncomeExpensenet	119000	USD
CY2017Q2	bkh	Disposal Group Including Discontinued Operations Total Operating Expenses DisposalGroupIncludingDiscontinuedOperationsTotalOperatingExpenses	7080000	USD
	bkh	Disposal Group Including Discontinued Operations Total Operating Expenses DisposalGroupIncludingDiscontinuedOperationsTotalOperatingExpenses	16230000	USD
CY2018Q2	bkh	Disposal Group Including Discontinued Operations Total Operating Expenses DisposalGroupIncludingDiscontinuedOperationsTotalOperatingExpenses	4709000	USD
	bkh	Disposal Group Including Discontinued Operations Total Operating Expenses DisposalGroupIncludingDiscontinuedOperationsTotalOperatingExpenses	11910000	USD
CY2017Q2	bkh	Effective Income Tax Rate Reconciliation Allowance For Other Funds Used During Construction Equity EffectiveIncomeTaxRateReconciliationAllowanceForOtherFundsUsedDuringConstructionEquity	-0.006
	bkh	Effective Income Tax Rate Reconciliation Allowance For Other Funds Used During Construction Equity EffectiveIncomeTaxRateReconciliationAllowanceForOtherFundsUsedDuringConstructionEquity	0.000
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	bkh	Effective Income Tax Rate Reconciliation Allowance For Other Funds Used During Construction Equity EffectiveIncomeTaxRateReconciliationAllowanceForOtherFundsUsedDuringConstructionEquity	-0.001
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	bkh	Effective Income Tax Rate Reconciliation Flow Through Accounting EffectiveIncomeTaxRateReconciliationFlowThroughAccounting	-0.010
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	bkh	Effective Income Tax Rate Reconciliation Flow Through Accounting EffectiveIncomeTaxRateReconciliationFlowThroughAccounting	-0.007
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	bkh	Effective Income Tax Reconciliation Tax Benefit Relatedto Legal Restructuring EffectiveIncomeTaxReconciliationTaxBenefitRelatedtoLegalRestructuring	0.000
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CY2017Q2	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	98164000	USD
	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	317941000	USD
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	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	352300000	USD
	bkh	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Income Loss Attributableto Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingIncomeLossAttributabletoRedeemableNoncontrollingInterest	105350000	USD
	bkh	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Income Loss Attributableto Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingIncomeLossAttributabletoRedeemableNoncontrollingInterest	161374000	USD
CY2017Q2	bkh	Operating Expense Maintenance Operationsand Other Costsand Expense OperatingExpenseMaintenanceOperationsandOtherCostsandExpense	111897000	USD
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	bkh	Operating Expense Maintenance Operationsand Other Costsand Expense OperatingExpenseMaintenanceOperationsandOtherCostsandExpense	234378000	USD
CY2017Q2	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	822000	USD
	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	1308000	USD
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	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	644000	USD
	bkh	Revenue Refunded To Customers As A Result Of The Tcja Tax Benefits RevenueRefundedToCustomersAsAResultOfTheTCJATaxBenefits	3300000	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
	dei	Document Period End Date DocumentPeriodEndDate	2018-06-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0001130464
CY2018Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	53594876	shares
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	BLACK HILLS CORP /SD/
	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	160887000	USD
CY2018Q2	us-gaap	Accounts Payable Current AccountsPayableCurrent	104718000	USD
CY2017Q2	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	109491000	USD
CY2017Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	126060000	USD
CY2018Q2	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	121135000	USD
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CY2017Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	1022000	USD
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CY2017Q2	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	191806000	USD
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CY2017Q2	us-gaap	Common Stock Value CommonStockValue	53514000	USD
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	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	100660000	USD
CY2018Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	23078000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	157342000	USD
CY2017Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	26100000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	107399000	USD
CY2018Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	25901000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	163795000	USD
CY2018Q2	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	36993000	USD
CY2017Q2	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	41068000	USD
CY2017Q4	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	44420000	USD
	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	5908000	USD
CY2017Q2	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	1575000	USD
CY2017Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	1552000	USD
CY2018Q2	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	1552000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	52385000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-21419000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	49000000	USD
CY2017Q2	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	609843000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	336520000	USD
CY2018Q2	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	289814000	USD
CY2017Q2	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	46825000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	93527000	USD
CY2018Q2	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	48709000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	97299000	USD
CY2017Q2	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	639000	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	304000	USD
CY2018Q2	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	666000	USD
CY2017Q2	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2018Q2	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2017Q2	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	676000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	2081000	USD
CY2018Q2	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	485000	USD
CY2017Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.01
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.04
CY2018Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.05
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.09
CY2017Q2	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-250000	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-1283000	USD
CY2018Q2	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-908000	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-1822000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	113999000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	0	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	0	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent	20654000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent	16966000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent	0	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Liabilities Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent	0	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Liabilities Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent	0	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Liabilities Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent	1153000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	1838000	USD
	us-gaap	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	3783000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	0	USD
	us-gaap	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	1300000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	5491000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.016
CY2018Q2	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.010
	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.010
CY2017Q2	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.012
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.006
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	12696000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	2718000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	8407000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-931000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-3606000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-3425000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-6711000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	8193000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	10360000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	378000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	10860000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	18966000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	4295000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	23048000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	22808000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	0	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	93089000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	56916000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	3179000	USD
CY2017Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	6149000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	12624000	USD
CY2018Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	1284000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	5199000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	47544000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	50879000	USD
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.86
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.90
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.79
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.85
CY2017Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.291
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.293
CY2018Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.194
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.131
CY2017Q2	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018Q2	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017Q2	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
CY2018Q2	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.003
	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.016
CY2017Q2	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.031
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.004
CY2018Q2	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.004
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.004
CY2017Q2	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.009
CY2018Q2	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.007
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.006
CY2017Q2	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.001
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.010
CY2018Q2	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.017
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.017
CY2017Q2	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.036
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.018
CY2018Q2	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.021
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.021
CY2017Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	44658000	USD
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	52467000	USD
CY2018Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	49225000	USD
CY2017Q2	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	23623000	USD
CY2017Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	40589000	USD
CY2018Q2	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	19558000	USD
CY2017Q2	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	3106000	USD
CY2017Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	2962000	USD
CY2018Q2	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	2821000	USD
CY2017Q2	us-gaap	Goodwill Goodwill	1299454000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	1299454000	USD
CY2018Q2	us-gaap	Goodwill Goodwill	1299454000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	22811000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	100903000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	24344000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	159691000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	36579000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	152682000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	33708000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	146883000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	25927000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	107642000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	27167000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	166144000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.43
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.90
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.46
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.99
CY2017Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.41
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.83
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.45
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.94
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-616000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2185000	USD
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2427000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-4770000	USD
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.04
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.05
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.09
CY2017Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10652000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45040000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6541000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-19261000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	14837000	USD
CY2017Q2	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2017Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2018Q2	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	11653000	USD
	us-gaap	Increase Decrease In Accounts Receivable And Other Operating Assets IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets	-94591000	USD
	us-gaap	Increase Decrease In Accounts Receivable And Other Operating Assets IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets	-50711000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-7753000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-18492000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-117134000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-96394000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	125000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1372000	USD
	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	-3086000	USD
	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	-55637000	USD
	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	19990000	USD
CY2017Q2	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	1977000	shares
	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	1796000	shares
CY2018Q2	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	1057000	shares
	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	904000	shares
CY2017Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	178000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	192000	shares
CY2018Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	108000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	120000	shares
CY2017Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7972000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7559000	USD
CY2018Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7155000	USD
CY2017Q2	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	58000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	133000	USD
CY2018Q2	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	60000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	77000	USD
CY2017Q2	us-gaap	Interest Costs Incurred InterestCostsIncurred	35072000	USD
	us-gaap	Interest Costs Incurred InterestCostsIncurred	70130000	USD
CY2018Q2	us-gaap	Interest Costs Incurred InterestCostsIncurred	35425000	USD
	us-gaap	Interest Costs Incurred InterestCostsIncurred	70880000	USD
	us-gaap	Interest Paid Net InterestPaidNet	65820000	USD
	us-gaap	Interest Paid Net InterestPaidNet	67119000	USD
CY2017Q2	us-gaap	Interest Payable Current InterestPayableCurrent	33914000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	33822000	USD
CY2018Q2	us-gaap	Interest Payable Current InterestPayableCurrent	33767000	USD
CY2017Q2	us-gaap	Inventory Net InventoryNet	95488000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	113283000	USD
CY2018Q2	us-gaap	Inventory Net InventoryNet	95454000	USD
CY2017Q2	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	68759000	USD
CY2017Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	69732000	USD
CY2018Q2	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	73075000	USD
CY2017Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	257000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	298000	USD
CY2018Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	320000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	630000	USD
CY2017Q2	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	24540000	USD
CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	26848000	USD
CY2018Q2	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	11448000	USD
CY2017Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6509746000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6658902000	USD
CY2018Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6570129000	USD
CY2017Q2	us-gaap	Liabilities Current LiabilitiesCurrent	438865000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	649101000	USD
CY2018Q2	us-gaap	Liabilities Current LiabilitiesCurrent	730635000	USD
CY2017Q2	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1120548000	USD
CY2017Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1080195000	USD
CY2018Q2	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1054893000	USD
CY2018Q2	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	1891000	USD
CY2017Q2	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	10904000	USD
CY2017Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	41774000	USD
CY2018Q2	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	5448000	USD
CY2017Q2	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	23048000	USD
CY2017Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	0	USD
CY2018Q2	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	0	USD
CY2017Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	5743000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	5743000	USD
CY2018Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	255743000	USD
CY2017Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3160302000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3109400000	USD
CY2018Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2858068000	USD
CY2017Q2	us-gaap	Long Term Investments LongTermInvestments	12761000	USD
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	13090000	USD
CY2018Q2	us-gaap	Long Term Investments LongTermInvestments	41148000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	8335000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	9998000	USD
	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	886000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-101069000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-153701000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-163530000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-163526000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-154056000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-181550000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	262869000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	310701000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	257632000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	309798000	USD
CY2017Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3116000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6739000	USD
CY2018Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2823000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6453000	USD
CY2017Q2	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	3116000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	6739000	USD
CY2018Q2	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2823000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	6453000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22195000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	98718000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	21917000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	154921000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5000000	USD
CY2017Q2	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	113792000	USD
CY2017Q4	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	111232000	USD
CY2018Q2	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	107687000	USD
CY2017Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-33217000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-67300000	USD
CY2018Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-35843000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-70942000	USD
CY2017Q2	us-gaap	Operating Expenses OperatingExpenses	272033000	USD
	us-gaap	Operating Expenses OperatingExpenses	669375000	USD
CY2018Q2	us-gaap	Operating Expenses OperatingExpenses	286153000	USD
	us-gaap	Operating Expenses OperatingExpenses	713268000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	69796000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	219982000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	69551000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	217825000	USD
CY2017Q2	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	38151000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	45172000	USD
CY2018Q2	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	34138000	USD
CY2017Q2	us-gaap	Other Assets Current OtherAssetsCurrent	20768000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	25367000	USD
CY2018Q2	us-gaap	Other Assets Current OtherAssetsCurrent	31431000	USD
CY2017Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	13594000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	10149000	USD
CY2018Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	17207000	USD
CY2017Q2	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	-31000	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	-62000	USD
CY2018Q2	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	-35000	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	-70000	USD
CY2017Q2	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-18000	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	-35000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-9000	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	-19000	USD
CY2017Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	789000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1942000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1161000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2421000	USD
CY2017Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-268000	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	-528000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-487000	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	-973000	USD
CY2017Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	146000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	300000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	135000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	271000	USD
CY2017Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2075000	USD
CY2018Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	525000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2015000	USD
CY2017Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	112550000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	105735000	USD
CY2018Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	104951000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	6445000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4884000	USD
CY2017Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-76000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-195000	USD
CY2018Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1551000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1723000	USD
CY2018Q2	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	3243000	USD
	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	5277000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-238000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	373000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	47544000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	50879000	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	0	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	24429000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	154294000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	156748000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	8335000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	9998000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	5717000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	6911000	USD
CY2017Q2	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	176102000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	159646000	USD
CY2018Q2	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	162199000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	2965000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1074000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6659000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1527000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	11375000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-89500000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	25311000	USD
	us-gaap	Profit Loss ProfitLoss	105457000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	24740000	USD
	us-gaap	Profit Loss ProfitLoss	161374000	USD
CY2017Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5423160000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5567518000	USD
CY2018Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5702065000	USD
CY2017Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4458611000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4541430000	USD
CY2018Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4614376000	USD
CY2017Q2	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	794000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1286000	USD
CY2018Q2	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	242000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	310000	USD
CY2017Q2	us-gaap	Regulatory Assets RegulatoryAssets	297160000	USD
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	297454000	USD
CY2018Q2	us-gaap	Regulatory Assets RegulatoryAssets	260702000	USD
CY2017Q2	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	53061000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	81016000	USD
CY2018Q2	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	50565000	USD
CY2017Q2	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	244099000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	216438000	USD
CY2018Q2	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	210137000	USD
CY2017Q2	us-gaap	Regulatory Liabilities RegulatoryLiabilities	216310000	USD
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	485126000	USD
CY2018Q2	us-gaap	Regulatory Liabilities RegulatoryLiabilities	550031000	USD
CY2017Q2	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	17305000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6832000	USD
CY2018Q2	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	52102000	USD
CY2017Q2	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	199005000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	478294000	USD
CY2018Q2	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	497929000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	52871000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2871000	USD
CY2017Q2	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	2534000	USD
CY2017Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	2820000	USD
CY2018Q2	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	3084000	USD
CY2017Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	512498000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	548617000	USD
CY2018Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	652642000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	352461000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	925816000	USD
CY2017Q2	us-gaap	Sales Revenue Net SalesRevenueNet	341829000	USD
	us-gaap	Sales Revenue Net SalesRevenueNet	889357000	USD
CY2018Q2	us-gaap	Sales Revenue Net SalesRevenueNet	355704000	USD
	us-gaap	Sales Revenue Net SalesRevenueNet	931093000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	6589000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5221000	USD
CY2017Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	107975000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	211300000	USD
CY2018Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	121800000	USD
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1530000	USD
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	219000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4133000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3194000	USD
CY2017Q2	us-gaap	Stockholders Equity StockholdersEquity	1676239000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1708974000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	1818846000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1730134000	USD
CY2017Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1790031000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1820206000	USD
CY2018Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1926533000	USD
	us-gaap	Stockholders Equity Other StockholdersEquityOther	7000	USD
	us-gaap	Stockholders Equity Other StockholdersEquityOther	4000	USD
	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	1400000	USD
CY2017Q2	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	13072000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	26458000	USD
CY2018Q2	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	13976000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	27276000	USD
CY2017Q2	us-gaap	Treasury Stock Shares TreasuryStockShares	39329	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	39064	shares
CY2018Q2	us-gaap	Treasury Stock Shares TreasuryStockShares	64981	shares
CY2017Q2	us-gaap	Treasury Stock Value TreasuryStockValue	2325000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2306000	USD
CY2018Q2	us-gaap	Treasury Stock Value TreasuryStockValue	3642000	USD
CY2017Q2	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	60270000	USD
CY2017Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	125351000	USD
CY2018Q2	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	58497000	USD
CY2016Q2	us-gaap	Variable Interest Entity Ownership Percentage VariableInterestEntityOwnershipPercentage	0.499
CY2017Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55384000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55179000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54520000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54361000	shares
CY2017Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53229000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53191000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53355000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53337000	shares
	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates and Basis of Presentation</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font 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 </font><font style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2018</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2017</font><font style="font-family:inherit;font-size:10pt;"> financial information and are of a normal recurring nature. 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, as well as changes in market prices. 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 </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">three</font><font style="font-family:inherit;font-size:10pt;"> and six months ended </font><font style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2018</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2017</font><font style="font-family:inherit;font-size:10pt;">, and our financial condition as of </font><font style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2018</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2017</font><font style="font-family:inherit;font-size:10pt;">, are not necessarily indicative of the results of operations and financial condition to be expected as of or for any other period. All earnings per share amounts discussed refer to diluted earnings per share unless otherwise noted.</font></div></div>

Files In Submission

Name	View Source	Status
0001130464-18-000044-index-headers.html	Edgar Link	pending
0001130464-18-000044-index.html	Edgar Link	pending
0001130464-18-000044.txt	Edgar Link	pending
0001130464-18-000044-xbrl.zip	Edgar Link	pending
bkh-20180630.xml	Edgar Link	completed
bkh-20180630.xsd	Edgar Link	pending
bkh-20180630_cal.xml	Edgar Link	unprocessable
bkh-20180630_def.xml	Edgar Link	unprocessable
bkh-20180630_lab.xml	Edgar Link	unprocessable
bkh-20180630_pre.xml	Edgar Link	unprocessable
bkh10qq22018.htm	Edgar Link	pending
bkhex-12compratioearningst.htm	Edgar Link	pending
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bkhex-95q22018.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
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$BKH
BLACK HILLS CORP /SD/ Stock $bkh

2018 Q2 Form 10-Q Financial Statement

#000113046418000044 Filed on August 07, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH BLACK HILLS CORP /SD/ Stock $bkh

2018 Q2 Form 10-Q Financial Statement

#000113046418000044 Filed on August 07, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH
BLACK HILLS CORP /SD/ Stock $bkh