$BKH
BLACK HILLS CORP /SD/ Stock $bkh

$bkh Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-Q Financial Statement

#000113046418000053 Filed on November 06, 2018

Income Statement

Concept	2018 Q4	2018 Q3	2017 Q3
Revenue	$501.2M	$322.0M	$335.6M
YoY Change	10.08%	-4.06%	3.54%
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	$50.00M	$49.05M	$47.11M
YoY Change	5.04%	4.11%	-3.71%
% of Gross Profit
Operating Expenses	$387.1M	$256.9M	$256.1M
YoY Change	14.49%	0.33%	-7.02%
Operating Profit	$114.1M	$65.09M	$79.56M
YoY Change	-2.62%	-18.19%	12.3%
Interest Expense	-$141.0M	-$35.30M	-$34.10M
YoY Change	307.51%	3.52%	-3.4%
% of Operating Profit	-123.55%	-54.24%	-42.86%
Other Income/Expense, Net	$106.6M	-$35.81M	-$33.18M
YoY Change	106500.0%	7.91%	-2.06%
Pretax Income	$79.70M	$29.28M	$46.38M
YoY Change	-3.63%	-36.87%	89.07%
Income Tax	-$11.90M	$7.500M	$13.48M
% Of Pretax Income	-14.93%	25.62%	29.06%
Net Earnings	$86.57M	$16.95M	$31.60M
YoY Change	70.75%	-46.36%	76.68%
Net Earnings / Revenue	17.27%	5.26%	9.42%
Basic Earnings Per Share	$1.50	$0.32	$0.52
Diluted Earnings Per Share	$1.49	$0.31	$0.50
COMMON SHARES
Basic Shares Outstanding	59.97M shares	53.36M shares	53.24M shares
Diluted Shares Outstanding		54.82M shares	55.43M shares

Balance Sheet

Concept	2018 Q4	2018 Q3	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$20.80M	$10.00M	$13.50M
YoY Change	35.06%	-25.93%	-78.57%
Cash & Equivalents	$20.78M	$10.00M	$13.45M
Short-Term Investments
Other Short-Term Assets	$29.98M	$32.69M	$25.59M
YoY Change	18.19%	27.77%	-14.8%
Inventory	$117.3M	$122.6M	$122.9M
Prepaid Expenses
Receivables	$269.2M	$152.8M	$150.3M
Other Receivables	$13.00M	$11.10M	$0.00
Total Short-Term Assets	$503.8M	$384.9M	$385.0M
YoY Change	-11.73%	-0.03%	-0.52%
LONG-TERM ASSETS
Property, Plant & Equipment	$4.855B	$4.700B	$4.499B
YoY Change	6.9%	4.48%	0.75%
Goodwill	$1.299B	$1.299B	$1.299B
YoY Change	0.0%	0.0%	-0.07%
Intangibles	$14.34M	$6.954M	$7.765M
YoY Change	89.67%	-10.44%	-13.18%
Long-Term Investments	$41.00M	$41.20M	$12.90M
YoY Change	212.98%	219.38%	4.03%
Other Assets	$14.35M	$17.14M	$11.63M
YoY Change	41.41%	47.45%	-9.17%
Total Long-Term Assets	$6.459B	$6.277B	$6.179B
YoY Change	6.1%	1.59%	296.95%
TOTAL ASSETS
Total Short-Term Assets	$503.8M	$384.9M	$385.0M
Total Long-Term Assets	$6.459B	$6.277B	$6.179B
Total Assets	$6.963B	$6.662B	$6.564B
YoY Change	4.57%	1.5%	2.22%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$210.6M	$115.9M	$94.79M
YoY Change	30.9%	22.27%	-14.32%
Accrued Expenses	$215.5M	$201.4M	$206.8M
YoY Change	-1.8%	-2.62%	-9.51%
Deferred Revenue
YoY Change
Short-Term Debt	$185.6M	$112.1M	$225.2M
YoY Change	-12.15%	-50.22%	200.23%
Long-Term Debt Due	$5.743M	$255.7M	$5.743M
YoY Change	0.0%	4353.13%	0.0%
Total Short-Term Liabilities	$648.2M	$730.2M	$554.3M
YoY Change	-0.13%	31.75%	23.26%
LONG-TERM LIABILITIES
Long-Term Debt	$2.951B	$2.951B	$3.110B
YoY Change	-5.1%	-5.1%	-3.17%
Other Long-Term Liabilities	$109.4M	$105.9M	$114.0M
YoY Change	3.44%	-7.08%	-19.16%
Total Long-Term Liabilities	$1.077B	$1.059B	$1.104B
YoY Change	-0.31%	-4.03%	6.8%
TOTAL LIABILITIES
Total Short-Term Liabilities	$648.2M	$730.2M	$554.3M
Total Long-Term Liabilities	$1.077B	$1.059B	$1.104B
Total Liabilities	$1.725B	$1.789B	$1.658B
YoY Change	-0.24%	7.93%	11.79%
SHAREHOLDERS EQUITY
Retained Earnings	$700.4M	$644.2M	$516.4M
YoY Change	27.67%	24.75%	11.75%
Common Stock	$60.05M	$53.66M	$53.53M
YoY Change	12.07%	0.26%	0.74%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.510M	$4.072M	$2.448M
YoY Change	8.85%	66.34%	111.95%
Treasury Stock Shares	44.25K shares	72.92K shares	41.46K shares
Shareholders Equity	$2.182B	$1.813B	$1.683B
YoY Change
Total Liabilities & Shareholders Equity	$6.963B	$6.662B	$6.564B
YoY Change	4.57%	1.5%	2.22%

Cashflow Statement

Concept	2018 Q4	2018 Q3	2017 Q3
OPERATING ACTIVITIES
Net Income	$86.57M	$16.95M	$31.60M
YoY Change	70.75%	-46.36%	76.68%
Depreciation, Depletion And Amortization	$50.00M	$49.05M	$47.11M
YoY Change	5.04%	4.11%	-3.71%
Cash From Operating Activities	$110.1M	$68.00M	$56.50M
YoY Change	1.1%	20.35%	-515.44%
INVESTING ACTIVITIES
Capital Expenditures	-$179.4M	-$121.4M	-$84.50M
YoY Change	105.73%	43.67%	-37.03%
Acquisitions
YoY Change
Other Investing Activities	-$4.700M	$3.200M	-$7.900M
YoY Change	-118.08%	-140.51%	3850.0%
Cash From Investing Activities	-$184.0M	-$118.3M	-$92.50M
YoY Change	201.15%	27.89%	-31.23%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	84.80M	51.80M	38.00M
YoY Change	-285.96%	36.32%	-51.72%
NET CHANGE
Cash From Operating Activities	110.1M	68.00M	56.50M
Cash From Investing Activities	-184.0M	-118.3M	-92.50M
Cash From Financing Activities	84.80M	51.80M	38.00M
Net Change In Cash	10.90M	1.500M	2.000M
YoY Change	395.45%	-25.0%	-102.88%
FREE CASH FLOW
Cash From Operating Activities	$110.1M	$68.00M	$56.50M
Capital Expenditures	-$179.4M	-$121.4M	-$84.50M
Free Cash Flow	$289.5M	$189.4M	$141.0M
YoY Change	47.63%	34.33%	16.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2016Q1	bkh	At The Market Equity Offering Program Authorized Aggregate Value AtTheMarketEquityOfferingProgramAuthorizedAggregateValue	200000000	USD
CY2017Q3	bkh	At The Market Equity Offering Program Authorized Aggregate Value AtTheMarketEquityOfferingProgramAuthorizedAggregateValue	300000000	USD
CY2018Q3	bkh	Commercial Paper Maximum Borrowing Capacity CommercialPaperMaximumBorrowingCapacity	750000000	USD
CY2017Q3	bkh	Disposal Group Including Discontinued Operation Derivative Assets Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrentandNoncurrent	225000	USD
CY2017Q4	bkh	Disposal Group Including Discontinued Operation Derivative Assets Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrentandNoncurrent	0	USD
CY2018Q3	bkh	Disposal Group Including Discontinued Operation Derivative Assets Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrentandNoncurrent	0	USD
	bkh	Disposal Group Including Discontinued Operation Gain Loss On Sale Of Assets DisposalGroupIncludingDiscontinuedOperationGainLossOnSaleOfAssets	2900000	USD
CY2017Q3	bkh	Disposal Group Including Discontinued Operations Derivative Liabilities Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationsDerivativeLiabilitiesCurrentandNoncurrent	114000	USD
CY2017Q4	bkh	Disposal Group Including Discontinued Operations Derivative Liabilities Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationsDerivativeLiabilitiesCurrentandNoncurrent	0	USD
CY2018Q3	bkh	Disposal Group Including Discontinued Operations Derivative Liabilities Currentand Noncurrent DisposalGroupIncludingDiscontinuedOperationsDerivativeLiabilitiesCurrentandNoncurrent	0	USD
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	bkh	Effective Income Tax Rate Reconciliation Allowance For Other Funds Used During Construction Equity EffectiveIncomeTaxRateReconciliationAllowanceForOtherFundsUsedDuringConstructionEquity	0.000
CY2018Q3	bkh	Effective Income Tax Rate Reconciliation Allowance For Other Funds Used During Construction Equity EffectiveIncomeTaxRateReconciliationAllowanceForOtherFundsUsedDuringConstructionEquity	-0.001
	bkh	Effective Income Tax Rate Reconciliation Allowance For Other Funds Used During Construction Equity EffectiveIncomeTaxRateReconciliationAllowanceForOtherFundsUsedDuringConstructionEquity	-0.001
	bkh	Effective Income Tax Rate Reconciliation Nol Carryback Specified Liability Loss EffectiveIncomeTaxRateReconciliationNOLCarrybackSpecifiedLiabilityLoss	-0.010
	bkh	Effective Income Tax Reconciliation Tax Benefit Relatedto Legal Restructuring EffectiveIncomeTaxReconciliationTaxBenefitRelatedtoLegalRestructuring	0.000
CY2017Q3	bkh	Effective Income Tax Rate Reconciliation Flow Through Accounting EffectiveIncomeTaxRateReconciliationFlowThroughAccounting	-0.016
	bkh	Effective Income Tax Rate Reconciliation Flow Through Accounting EffectiveIncomeTaxRateReconciliationFlowThroughAccounting	-0.012
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	bkh	Effective Income Tax Rate Reconciliation Flow Through Accounting EffectiveIncomeTaxRateReconciliationFlowThroughAccounting	-0.008
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	bkh	Effective Income Tax Reconciliation Tax Benefit Relatedto Legal Restructuring EffectiveIncomeTaxReconciliationTaxBenefitRelatedtoLegalRestructuring	-0.281
CY2017Q3	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	86281000	USD
	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	404222000	USD
CY2018Q3	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	80244000	USD
	bkh	Fuel Purchased Power And Cost Of Gas Sold FuelPurchasedPowerAndCostOfGasSold	432544000	USD
	bkh	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Income Loss Attributableto Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingIncomeLossAttributabletoRedeemableNoncontrollingInterest	136948000	USD
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CY2018Q3	bkh	Numberof States That Have Received State Utility Commission Approvalsto Providethe Benefitsof Federal Tax Reformto Utility Customers NumberofStatesThatHaveReceivedStateUtilityCommissionApprovalstoProvidetheBenefitsofFederalTaxReformtoUtilityCustomers	6	State
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	bkh	Operating Expense Maintenance Operationsand Other Costsand Expense OperatingExpenseMaintenanceOperationsandOtherCostsandExpense	350099000	USD
CY2017Q3	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	753000	USD
	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	2061000	USD
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	bkh	Public Utilities Allowance For Funds Used During Construction Borrowed Interest Costs Capitalized PublicUtilitiesAllowanceForFundsUsedDuringConstructionBorrowedInterestCostsCapitalized	1345000	USD
	bkh	Revenue Refunded To Customers As A Result Of The Tcja Tax Benefits RevenueRefundedToCustomersAsAResultOfTheTCJATaxBenefits	7900000	USD
	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	2018
	dei	Document Period End Date DocumentPeriodEndDate	2018-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0001130464
CY2018Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	59974620	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/
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CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2017Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	53524529	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	53579986	shares
CY2018Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	53661863	shares
CY2017Q3	us-gaap	Common Stock Value CommonStockValue	53525000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	53580000	USD
CY2018Q3	us-gaap	Common Stock Value CommonStockValue	53662000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	28038000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	128698000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18010000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	175352000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	31973000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	139372000	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	185799000	USD
CY2017Q3	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	41012000	USD
CY2017Q4	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	44420000	USD
CY2018Q3	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	42002000	USD
CY2017Q3	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	1575000	USD
CY2017Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	1552000	USD
CY2018Q3	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	1552000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	65536000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-14396000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	49000000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	618315000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	336520000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	292753000	USD
CY2017Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	47109000	USD
CY2018Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	49046000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	146345000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	140636000	USD
CY2017Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	433000	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	304000	USD
CY2018Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	1392000	USD
CY2017Q3	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
CY2018Q3	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
CY2017Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1458000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	2081000	USD
CY2018Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1154000	USD
CY2017Q3	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	-0.06
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	-0.10
CY2017Q3	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	108685000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	0	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	0	USD
CY2017Q3	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent	12571000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent	16966000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent	0	USD
CY2017Q3	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
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Liabilities Noncurrent DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent	400000	USD
CY2017Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	8457000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	10360000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	75000	USD
CY2017Q3	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	7597000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	18966000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	2138000	USD
CY2017Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	23319000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	22808000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	0	USD
CY2017Q3	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	96085000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	56916000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	2779000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	71334000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	76309000	USD
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.38
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.22
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.29
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.15
CY2017Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.291
CY2018Q3	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
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.294
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.255
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.067
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.176
	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.043
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.030
	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.019
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.013
	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.011
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.009
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.006
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.005
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	-0.004
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.013
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.019
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.007
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.034
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.003
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.063
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.004
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	-0.006
	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	-0.002
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.000
	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.000
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.016
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.016
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.053
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.026
CY2017Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	52841000	USD
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	52467000	USD
CY2018Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	57600000	USD
CY2017Q3	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	49589000	USD
CY2017Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	40589000	USD
CY2018Q3	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	46091000	USD
CY2017Q3	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	2993000	USD
CY2017Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	2962000	USD
CY2018Q3	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	2750000	USD
CY2017Q3	us-gaap	Goodwill Goodwill	1299454000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	1299454000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	1299454000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	28963000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	129866000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	17807000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	177498000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	46376000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	199058000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	29278000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	176161000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	32898000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	140540000	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	187945000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.54
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.44
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.33
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.33
CY2017Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.52
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.35
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	3.26
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1300000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-3485000	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	-5627000	USD
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.02
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.06
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.02
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.10
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13478000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	58518000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7477000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-11784000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	5300000	USD
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	7500000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	14842000	USD
CY2017Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2017Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2018Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	11025000	USD
	us-gaap	Increase Decrease In Accounts Receivable And Other Operating Assets IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets	-103963000	USD
	us-gaap	Increase Decrease In Accounts Receivable And Other Operating Assets IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets	-72061000	USD
	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	1362000	USD
	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	155000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	19511000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	8380000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-112288000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-86604000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1410000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2007000	USD
	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	-1287000	USD
	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	-41655000	USD
	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-4328000	USD
	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	21416000	USD
CY2017Q3	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	2015000	shares
	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	1872000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	174000	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	1060000	shares
CY2017Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	174000	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	102000	shares
CY2017Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7765000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7559000	USD
CY2018Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	6954000	USD
CY2017Q3	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	64000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	197000	USD
CY2018Q3	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	100000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	177000	USD
CY2017Q3	us-gaap	Interest Costs Incurred InterestCostsIncurred	35287000	USD
	us-gaap	Interest Costs Incurred InterestCostsIncurred	105417000	USD
CY2018Q3	us-gaap	Interest Costs Incurred InterestCostsIncurred	36480000	USD
	us-gaap	Interest Costs Incurred InterestCostsIncurred	107360000	USD
	us-gaap	Interest Paid Net InterestPaidNet	102008000	USD
	us-gaap	Interest Paid Net InterestPaidNet	104035000	USD
CY2017Q3	us-gaap	Interest Payable Current InterestPayableCurrent	30977000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	33822000	USD
CY2018Q3	us-gaap	Interest Payable Current InterestPayableCurrent	31139000	USD
CY2017Q3	us-gaap	Inventory Net InventoryNet	122866000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	113283000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	122618000	USD
CY2017Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	70284000	USD
CY2017Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	69732000	USD
CY2018Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	73777000	USD
CY2017Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	402000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	700000	USD
CY2018Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	382000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	1012000	USD
CY2017Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	25391000	USD
CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	26848000	USD
CY2018Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	15203000	USD
CY2017Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6563748000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6658902000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6661938000	USD
CY2017Q3	us-gaap	Liabilities Current LiabilitiesCurrent	554270000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	649101000	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	730230000	USD
CY2017Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1103632000	USD
CY2017Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1080195000	USD
CY2018Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1059140000	USD
CY2017Q3	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	7701000	USD
CY2017Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	41774000	USD
CY2018Q3	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	2538000	USD
CY2017Q3	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	23329000	USD
CY2017Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	0	USD
CY2018Q3	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	0	USD
CY2017Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	5743000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	5743000	USD
CY2018Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	255743000	USD
CY2017Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3109864000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3109400000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2951389000	USD
CY2017Q3	us-gaap	Long Term Investments LongTermInvestments	12947000	USD
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	13090000	USD
CY2018Q3	us-gaap	Long Term Investments LongTermInvestments	41202000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	12884000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	13755000	USD
	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	886000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-63112000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-101949000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-255978000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-281771000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-238680000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-299795000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	319430000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	378722000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	305452000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	380884000	USD
CY2017Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3935000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	10674000	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3994000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	10447000	USD
CY2017Q3	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	3935000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	10674000	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	3994000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	10447000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	27663000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	126381000	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	171871000	USD
CY2017Q3	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	113178000	USD
CY2017Q4	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	111232000	USD
CY2018Q3	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	107924000	USD
CY2017Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-33183000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-100483000	USD
CY2018Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-35807000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-106749000	USD
CY2017Q3	us-gaap	Operating Expenses OperatingExpenses	256052000	USD
	us-gaap	Operating Expenses OperatingExpenses	925427000	USD
CY2018Q3	us-gaap	Operating Expenses OperatingExpenses	256894000	USD
	us-gaap	Operating Expenses OperatingExpenses	970162000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	79559000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	299541000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	65085000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	282910000	USD
CY2017Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	43381000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	45172000	USD
CY2018Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	31400000	USD
CY2017Q3	us-gaap	Other Assets Current OtherAssetsCurrent	25586000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	25367000	USD
CY2018Q3	us-gaap	Other Assets Current OtherAssetsCurrent	32691000	USD
CY2017Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	11626000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	10149000	USD
CY2018Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	17143000	USD
CY2017Q3	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	-32000	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	-94000	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	-104000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-17000	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	-52000	USD
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
CY2017Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	375000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2317000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1060000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3481000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-269000	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	-797000	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	-1456000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	145000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	445000	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
CY2017Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	996000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5996000	USD
CY2018Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	222000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1993000	USD
CY2017Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	113996000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	105735000	USD
CY2018Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	105928000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	3549000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7668000	USD
CY2017Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	189000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-6000	USD
CY2018Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	48302000	USD
CY2017Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	239571000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	216438000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-703000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2426000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-160000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2766000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	71334000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	76309000	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	238840000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	278132000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	12884000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	13755000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	8470000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	10641000	USD
CY2017Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	149803000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	159646000	USD
CY2018Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	151613000	USD
	us-gaap	Pension Contributions PensionContributions	27700000	USD
	us-gaap	Pension Contributions PensionContributions	12700000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3562000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1079000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	700000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6719000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10457000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	128570000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-99200000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	31598000	USD
	us-gaap	Profit Loss ProfitLoss	137055000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	20944000	USD
	us-gaap	Profit Loss ProfitLoss	182318000	USD
CY2017Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5499557000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5567518000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5819000000	USD
CY2017Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4498682000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4541430000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4700217000	USD
CY2017Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	696000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1982000	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	503000	USD
CY2017Q3	us-gaap	Regulatory Assets RegulatoryAssets	300594000	USD
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	297454000	USD
CY2018Q3	us-gaap	Regulatory Assets RegulatoryAssets	260350000	USD
CY2017Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	61023000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	81016000	USD
CY2018Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	212048000	USD
CY2017Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	205231000	USD
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	485126000	USD
CY2018Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	550288000	USD
CY2017Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	7042000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6832000	USD
CY2018Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	41442000	USD
CY2017Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	198189000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	478294000	USD
CY2018Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	508846000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	104307000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	603307000	USD
CY2017Q3	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	2683000	USD
CY2017Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	2820000	USD
CY2018Q3	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	3241000	USD
CY2017Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	516371000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	548617000	USD
CY2018Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	644154000	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	1245981000	USD
CY2017Q3	us-gaap	Revenues Revenues	335611000	USD
	us-gaap	Revenues Revenues	1224968000	USD
CY2018Q3	us-gaap	Revenues Revenues	321979000	USD
	us-gaap	Revenues Revenues	1253072000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7594000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7544000	USD
CY2017Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	225170000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	211300000	USD
CY2018Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	112100000	USD
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2300000	USD
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	220000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	5853000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4871000	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	1682804000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1708974000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	1813255000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1730134000	USD
CY2017Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1795982000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1820206000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1921179000	USD
	us-gaap	Stockholders Equity Other StockholdersEquityOther	180000	USD
	us-gaap	Stockholders Equity Other StockholdersEquityOther	-147000	USD
	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	1400000	USD
CY2017Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	12408000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	38866000	USD
CY2018Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	11905000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	39181000	USD
CY2017Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	41457	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	39064	shares
CY2018Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	72915	shares
CY2017Q3	us-gaap	Treasury Stock Value TreasuryStockValue	2448000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2306000	USD
CY2018Q3	us-gaap	Treasury Stock Value TreasuryStockValue	4072000	USD
CY2017Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	54278000	USD
CY2017Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	125351000	USD
CY2018Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	56149000	USD
CY2016Q2	us-gaap	Variable Interest Entity Ownership Percentage VariableInterestEntityOwnershipPercentage	0.499
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55432000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55254000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54819000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54508000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53243000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53208000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53364000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53346000	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;">September 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;">September 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 nine months ended </font><font style="font-family:Times New Roman;font-size:10pt;color:#000000;text-decoration:none;">September 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;">September 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;">September 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;">September 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
0001130464-18-000053-index-headers.html	Edgar Link	pending
0001130464-18-000053-index.html	Edgar Link	pending
0001130464-18-000053.txt	Edgar Link	pending
0001130464-18-000053-xbrl.zip	Edgar Link	pending
bkh-20180930.xml	Edgar Link	completed
bkh-20180930.xsd	Edgar Link	pending
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bkh-20180930_def.xml	Edgar Link	unprocessable
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bkh-20180930_pre.xml	Edgar Link	unprocessable
bkh10qq32018.htm	Edgar Link	pending
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$BKH
BLACK HILLS CORP /SD/ Stock $bkh

2018 Q4 Form 10-Q Financial Statement

#000113046418000053 Filed on November 06, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH BLACK HILLS CORP /SD/ Stock $bkh

2018 Q4 Form 10-Q Financial Statement

#000113046418000053 Filed on November 06, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH
BLACK HILLS CORP /SD/ Stock $bkh