$BKH
BLACK HILLS CORP /SD/ Stock $bkh

$bkh Overview Financials Valuation SEC Filings Company Website

2010 Form 10-K Financial Statement

#000113046411000027 Filed on February 25, 2011

Income Statement

Concept	2010	2009 Q4	2009
Revenue	$1.307B	$348.5M	$1.270B
YoY Change	2.97%	-14.54%	26.23%
Cost Of Revenue
YoY Change
Gross Profit	$652.7M		$603.5M
YoY Change	8.16%
Gross Profit Margin	49.93%		47.53%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$126.6M	$28.40M	$120.9M
YoY Change	4.69%	-21.76%	12.75%
% of Gross Profit	19.4%		20.04%
Operating Expenses	$1.036B	$297.8M	$1.075B
YoY Change	-3.56%	-15.83%	13.12%
Operating Profit	$183.4M		$124.2M
YoY Change	47.73%		122.19%
Interest Expense	$90.61M	-$3.500M	$83.25M
YoY Change	8.83%	-96.89%	42.92%
% of Operating Profit	49.4%		67.06%
Other Income/Expense, Net	-$101.5M	$2.300M	-$16.10M
YoY Change	530.14%	27.78%	-88.63%
Pretax Income	$83.75M	$49.40M	$108.8M
YoY Change	-23.01%	-133.22%	-226.78%
Income Tax	$22.17M	$17.00M	$32.85M
% Of Pretax Income	26.47%	34.41%	30.2%
Net Earnings	$68.69M	$32.80M	$81.56M
YoY Change	-15.78%	-133.2%	-22.48%
Net Earnings / Revenue	5.25%	9.41%	6.42%
Basic Earnings Per Share	$1.76		$2.11
Diluted Earnings Per Share	$1.76	$845.4K	$2.11
COMMON SHARES
Basic Shares Outstanding	38.92M shares		38.61M shares
Diluted Shares Outstanding	39.09M shares		38.68M shares

Balance Sheet

Concept	2010	2009 Q4	2009
SHORT-TERM ASSETS
Cash & Short-Term Investments	$16.40M	$112.9M	$112.9M
YoY Change	-85.47%	-33.0%	-33.0%
Cash & Equivalents	$16.40M	$112.9M	$112.9M
Short-Term Investments
Other Short-Term Assets	$433.0M	$27.27M	$112.1M
YoY Change	286.26%	-79.84%	-17.15%
Inventory	$62.90M	$123.3M	$123.3M
Prepaid Expenses
Receivables	$171.8M	$274.5M	$274.5M
Other Receivables	$0.00	$2.000M	$2.000M
Total Short-Term Assets	$684.2M	$624.9M	$624.9M
YoY Change	9.49%	-21.84%	-21.84%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.492B	$2.161B	$2.161B
YoY Change	15.32%	6.85%	6.85%
Goodwill		$352.3M
YoY Change
Intangibles		$4.309M
YoY Change		-11.77%
Long-Term Investments	$17.80M	$18.50M	$18.50M
YoY Change	-3.78%	-18.86%	-18.86%
Other Assets	$160.4M	$16.18M	$155.5M
YoY Change	3.15%	-90.56%	-9.22%
Total Long-Term Assets	$3.027B	$513.6M	$2.693B
YoY Change	12.42%	-80.1%	4.36%
TOTAL ASSETS
Total Short-Term Assets	$684.2M	$624.9M	$624.9M
Total Long-Term Assets	$3.027B	$513.6M	$2.693B
Total Assets	$3.712B	$3.318B	$3.318B
YoY Change	11.87%	-1.84%	-1.84%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$146.6M	$229.4M	$229.4M
YoY Change	-36.09%	-20.61%	-20.6%
Accrued Expenses	$147.6M	$151.5M	$151.5M
YoY Change	-2.57%	12.31%	12.31%
Deferred Revenue
YoY Change
Short-Term Debt	$249.0M	$164.5M	$164.5M
YoY Change	51.37%	-76.63%	-76.63%
Long-Term Debt Due	$5.200M	$35.25M	$35.20M
YoY Change	-85.23%	1578.33%	1576.19%
Total Short-Term Liabilities	$793.6M	$644.9M	$644.9M
YoY Change	23.06%	-48.56%	-48.56%
LONG-TERM LIABILITIES
Long-Term Debt	$1.186B	$1.016B	$1.016B
YoY Change	16.75%	102.66%	102.65%
Other Long-Term Liabilities	$631.6M	$114.9M	$572.1M
YoY Change	10.4%	-79.99%	-0.4%
Total Long-Term Liabilities	$1.818B	$572.1M	$1.588B
YoY Change	14.46%	-46.82%	47.62%
TOTAL LIABILITIES
Total Short-Term Liabilities	$793.6M	$644.9M	$644.9M
Total Long-Term Liabilities	$1.818B	$572.1M	$1.588B
Total Liabilities	$2.611B	$1.217B	$2.233B
YoY Change	16.94%	-47.76%	-4.14%
SHAREHOLDERS EQUITY
Retained Earnings		$473.9M
YoY Change
Common Stock		$38.98M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)		$224.0K
YoY Change
Treasury Stock Shares		8.834M shares
Shareholders Equity	$1.100B	$1.085B	$1.085B
YoY Change
Total Liabilities & Shareholders Equity	$3.712B	$3.318B	$3.318B
YoY Change	11.87%	-1.84%	-1.84%

Cashflow Statement

Concept	2010	2009 Q4	2009
OPERATING ACTIVITIES
Net Income	$68.69M	$32.80M	$81.56M
YoY Change	-15.78%	-133.2%	-22.48%
Depreciation, Depletion And Amortization	$126.6M	$28.40M	$120.9M
YoY Change	4.69%	-21.76%	12.75%
Cash From Operating Activities	$147.8M	-$400.0K	$270.5M
YoY Change	-45.38%	-100.61%	85.73%
INVESTING ACTIVITIES
Capital Expenditures	-$472.3M	-$101.6M	-$346.7M
YoY Change	36.23%	-7.21%	5.41%
Acquisitions
YoY Change
Other Investing Activities	-$15.41M	-$16.90M	$15.49M
YoY Change	-199.44%	-262.5%	-441.5%
Cash From Investing Activities	-$389.2M	-$118.4M	-$269.8M
YoY Change	44.23%	19.23%	-40.96%
FINANCING ACTIVITIES
Cash Dividend Paid	$56.47M		$55.15M
YoY Change	2.39%		2.77%
Common Stock Issuance & Retirement, Net	$3.246M		$4.819M
YoY Change	-32.64%		79.61%
Debt Paid & Issued, Net	$59.93M		$2.173M
YoY Change	2657.75%		-98.33%
Cash From Financing Activities	$161.0M	94.10M	-$56.31M
YoY Change	-385.83%	88.96%	-114.12%
NET CHANGE
Cash From Operating Activities	$147.8M	-400.0K	$270.5M
Cash From Investing Activities	-$389.2M	-118.4M	-$269.8M
Cash From Financing Activities	$161.0M	94.10M	-$56.31M
Net Change In Cash	-$80.46M	-24.70M	-$55.63M
YoY Change	44.64%	-254.37%	-163.74%
FREE CASH FLOW
Cash From Operating Activities	$147.8M	-$400.0K	$270.5M
Capital Expenditures	-$472.3M	-$101.6M	-$346.7M
Free Cash Flow	$620.1M	$101.2M	$617.2M
YoY Change	0.46%	-42.17%	30.06%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2008	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	145641000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	270502000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	147752000	USD
CY2009	us-gaap	Investment Income Interest InvestmentIncomeInterest	1612000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	694000	USD
CY2008	us-gaap	Investment Income Interest InvestmentIncomeInterest	2176000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2008	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	130000	USD
CY2009	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2009	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	0	USD
CY2010	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	0	USD
CY2008	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-73928000	USD
CY2009Q4	us-gaap	Treasury Stock Value TreasuryStockValue	224000	USD
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	309000	USD
CY2009Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	229352000	USD
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	279069000	USD
CY2010Q4	us-gaap	Inventory Net InventoryNet	139677000	USD
CY2009Q4	us-gaap	Inventory Net InventoryNet	123322000	USD
CY2010Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	9260000	USD
CY2009Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	3777000	USD
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2008	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.75
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.11
CY2009Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	11999000	USD
CY2010Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	21361000	USD
CY2008	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-1318000	USD
CY2009	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-349000	USD
CY2010	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-4381000	USD
CY2008	us-gaap	Pension Contributions PensionContributions	500000	USD
CY2009	us-gaap	Pension Contributions PensionContributions	16945000	USD
CY2010	us-gaap	Pension Contributions PensionContributions	30015000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	267586000	USD
CY2008	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	127588000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	147752000	USD
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.11
CY2008	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.75
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.76
CY2008	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	3835000	USD
CY2010	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	2996000	USD
CY2009	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	5891000	USD
CY2010Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	637749000	USD
CY2009Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	572090000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1100270000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	1084837000	USD
CY2007Q4	us-gaap	Stockholders Equity StockholdersEquity	969855000	USD
CY2008Q4	us-gaap	Stockholders Equity StockholdersEquity	1050536000	USD
CY2009Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	37747000	USD
CY2010Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	56572000	USD
CY2009Q4	us-gaap	Assets Current AssetsCurrent	624870000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	670871000	USD
CY2008	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12907000	USD
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-7574000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10400000	USD
CY2009Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	135578000	USD
CY2010Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	138405000	USD
CY2009	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6157000	USD
CY2008	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3585000	USD
CY2010	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4817000	USD
CY2010	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2010	dei	Amendment Flag AmendmentFlag	false
CY2010Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3359762000	USD
CY2009Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2975993000	USD
CY2010Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	779000	USD
CY2009Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-389168000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-269823000	USD
CY2008	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-457052000	USD
CY2008	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	835592000	USD
CY2009	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2010	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2010Q4	us-gaap	Goodwill Goodwill	354831000	USD
CY2009Q4	us-gaap	Goodwill Goodwill	353734000	USD
CY2010	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	50000	USD
CY2009	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	1265000	USD
CY2008	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	526000	USD
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CY2008	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-21453000	USD
CY2009	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-53157000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25298000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33315000	USD
CY2008	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-29395000	USD
CY2010	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2010
CY2010	us-gaap	Other Income OtherIncome	2921000	USD
CY2008	us-gaap	Other Income OtherIncome	1064000	USD
CY2009	us-gaap	Other Income OtherIncome	5943000	USD
CY2009Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	114928000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	129932000	USD
CY2010	us-gaap	Stockholders Equity Other StockholdersEquityOther	-5000	USD
CY2008	us-gaap	Stockholders Equity Other StockholdersEquityOther	1185000	USD
CY2010Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	79167000	USD
CY2009Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	57166000	USD
CY2010	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q4
CY2010Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	0	USD
CY2009Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	2031000	USD
CY2010	us-gaap	Dilutive Securities DilutiveSecurities	-288000	USD
CY2009Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	513574000	USD
CY2010Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	527425000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.04
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.76
CY2008	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-1.37
CY2008	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4366000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1559000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1343000	USD
CY2009Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	7092000	USD
CY2010Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	3943000	USD
CY2009Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	8834	shares
CY2010Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	10962	shares
CY2010Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4069000	USD
CY2009Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4309000	USD
CY2010Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	66429000	USD
CY2009Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	25085000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.04
CY2008	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.37
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.76
CY2010	dei	Document Type DocumentType	10-K
CY2009	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	55653000	USD
CY2008	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-94440000	USD
CY2010	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-15193000	USD
CY2009	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	586000000	USD
CY2010	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	854500000	USD
CY2008	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1150300000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	68685000	USD
CY2009	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	78756000	USD
CY2008	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-52037000	USD
CY2008	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-53663000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-56467000	USD
CY2009	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-55151000	USD
CY2010	us-gaap	Interest Expense InterestExpense	107790000	USD
CY2008	us-gaap	Interest Expense InterestExpense	58252000	USD
CY2009	us-gaap	Interest Expense InterestExpense	90878000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	200000000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	543069000	USD
CY2008	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2008	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	36400000	USD
CY2009	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	-2598000	USD
CY2010	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	21283000	USD
CY2009	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	43301000	USD
CY2010	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2008	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	91782000	USD
CY2009	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	25971000	USD
CY2010	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	8921000	USD
CY2008	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
CY2010	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2008	bkh	Accounts Receivable And Other Current Assets AccountsReceivableAndOtherCurrentAssets	-50955000	USD
CY2010	bkh	Accounts Receivable And Other Current Assets AccountsReceivableAndOtherCurrentAssets	-51443000	USD
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CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	3983000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	5849000	USD
CY2008	us-gaap	Share Based Compensation ShareBasedCompensation	2657000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	64268000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	81174000	USD
CY2008	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	110805000	USD
CY2010	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	27602000	USD
CY2009	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	22231000	USD
CY2008	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	27684000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-80463000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-55631000	USD
CY2008	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	87277000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-56310000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	160953000	USD
CY2008	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	398688000	USD
CY2009Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	262034000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	277136000	USD
CY2010	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2008	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	7779000	USD
CY2009	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	16349000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	16342000	USD
CY2011Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	39262118	shares
CY2010	us-gaap	Goodwill Allocation Adjustment GoodwillAllocationAdjustment	0	USD
CY2009	us-gaap	Goodwill Allocation Adjustment GoodwillAllocationAdjustment	7880000	USD
CY2008	us-gaap	Goodwill Allocation Adjustment GoodwillAllocationAdjustment	0	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	20860000	USD
CY2009Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	16176000	USD
CY2008	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-14525000	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1078000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	25265000	USD
CY2008	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38193000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38614000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38916000	shares
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-23581000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-19164000	USD
CY2010	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	124709000	USD
CY2009Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	140671000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2008	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	157247000	USD
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	2799000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	88891000	USD
CY2009	us-gaap	Costs And Expenses CostsAndExpenses	85938000	USD
CY2008	us-gaap	Costs And Expenses CostsAndExpenses	113210000	USD
CY2010Q2	dei	Entity Public Float EntityPublicFloat	1102103935	USD
CY2008	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-2811000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-10689000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-5839000	USD
CY2009Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2160730000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2495433000	USD
CY2010Q4	us-gaap	Long Term Investments LongTermInvestments	17780000	USD
CY2009Q4	us-gaap	Long Term Investments LongTermInvestments	18524000	USD
CY2010	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	472681000	USD
CY2008	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	328922000	USD
CY2009	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	346872000	USD
CY2008	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	2581000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	1343000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	1559000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2173000	USD
CY2008	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	130297000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	59926000	USD
CY2009	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-27362000	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-10873000	USD
CY2008	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	36847000	USD
CY2010	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2009	bkh	Fuel And Purchased Power FuelAndPurchasedPower	652725000	USD
CY2008	bkh	Fuel And Purchased Power FuelAndPurchasedPower	448411000	USD
CY2010	bkh	Fuel And Purchased Power FuelAndPurchasedPower	626528000	USD
CY2008	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	38193000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	38684000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39091000	shares
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2008	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	4.12
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.07
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	251375000	USD
CY2009	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	241995000	USD
CY2008	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	152424000	USD
CY2008	us-gaap	Cumulative Effect Of Initial Adoption Of New Accounting Principle CumulativeEffectOfInitialAdoptionOfNewAccountingPrinciple	-1357000	USD
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.07
CY2008	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	4.12
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39280048	shares
CY2009Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	38977526	shares
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-15406000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	15492000	USD
CY2008	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-4537000	USD
CY2009	us-gaap	Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities Other AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther	4036000	USD
CY2008	us-gaap	Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities Other AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther	6720000	USD
CY2010	us-gaap	Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities Other AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther	-3218000	USD
CY2010	us-gaap	Payments Of Dividends PaymentsOfDividends	56467000	USD
CY2009	us-gaap	Payments Of Dividends PaymentsOfDividends	55151000	USD
CY2008	us-gaap	Payments Of Dividends PaymentsOfDividends	53663000	USD
CY2010	dei	Entity Central Index Key EntityCentralIndexKey	0001130464
CY2008	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	0	USD
CY2010	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	70357000	USD
CY2009	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	84661000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-56310000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	160953000	USD
CY2008	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	472616000	USD
CY2010Q4	us-gaap	Assets Assets	3711509000	USD
CY2009Q4	us-gaap	Assets Assets	3317698000	USD
CY2010Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	4260000	USD
CY2009Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	17502000	USD
CY2009Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	42458000	USD
CY2010Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	84611000	USD
CY2008	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	105080000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	68685000	USD
CY2009	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	81555000	USD
CY2009	us-gaap	Revenues Revenues	1269578000	USD
CY2010	us-gaap	Revenues Revenues	1307251000	USD
CY2008	us-gaap	Revenues Revenues	1005790000	USD
CY2009	us-gaap	Operating Expenses OperatingExpenses	1142746000	USD
CY2008	us-gaap	Operating Expenses OperatingExpenses	949913000	USD
CY2010	us-gaap	Operating Expenses OperatingExpenses	1113349000	USD
CY2010	us-gaap	Commitments And Contingencies2009 CommitmentsAndContingencies2009
CY2009	us-gaap	Commitments And Contingencies2009 CommitmentsAndContingencies2009
CY2009	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-7892000	USD
CY2008	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-4446000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1412000	USD
CY2010	dei	Entity Registrant Name EntityRegistrantName	BLACK HILLS CORP /SD/
CY2009Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	815263000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	864329000	USD
CY2009	us-gaap	Utility Revenue UtilityRevenue	1100204000	USD
CY2010	us-gaap	Utility Revenue UtilityRevenue	1120721000	USD
CY2008	us-gaap	Utility Revenue UtilityRevenue	749250000	USD
CY2009	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2241000	USD
CY2010	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3141000	USD
CY2008	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-141675000	USD
CY2009	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-16104000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-101478000	USD
CY2009	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2008	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	938423000	USD
CY2010	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	2250000	USD
CY2010	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	186530000	USD
CY2009	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	169374000	USD
CY2008	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	256540000	USD
CY2009Q4	us-gaap	Common Stock Value CommonStockValue	38978000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	39280000	USD
CY2010	dei	Document Period End Date DocumentPeriodEndDate	2010-12-31
CY2009	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0	USD
CY2008	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-29836000	USD
CY2010	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	32438000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	112901000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	168532000	USD
CY2007Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	81255000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3711509000	USD
CY2009Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3317698000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-269823000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-389168000	USD
CY2008	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-427216000	USD
CY2010	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	770000000	USD
CY2009	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	1125300000	USD
CY2008	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	483500000	USD
CY2009Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1015912000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1186050000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	4523000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	17113000	USD
CY2009Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	591390000	USD
CY2010Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	598805000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	486075000	USD
CY2009Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	473857000	USD
CY2008	us-gaap	Profit Loss ProfitLoss	105210000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	68685000	USD
CY2009	us-gaap	Profit Loss ProfitLoss	81555000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	2996000	USD
CY2008	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	3835000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	5891000	USD
CY2009Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	35245000	USD
CY2010Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	5181000	USD
CY2009	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	4819000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3246000	USD
CY2008	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	2683000	USD
CY2010Q4	us-gaap	Notes Payable Current NotesPayableCurrent	249000000	USD
CY2009Q4	us-gaap	Notes Payable Current NotesPayableCurrent	164500000	USD
CY2010Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2009Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2009	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	25971000	USD
CY2008	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2010	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	8921000	USD
CY2009	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	-120000	USD
CY2008	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	432000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	-33000	USD
CY2008	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	107263000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	121297000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	126894000	USD
CY2009Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	100000000	shares
CY2010Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	100000000	shares
CY2008	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	187000	USD
CY2009	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	513000	USD
CY2010	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	176000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	19206000	USD
CY2008	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2058000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	39743000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-4417000	USD
CY2008	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	5725000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-381000	USD
CY2009Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	151504000	USD
CY2010Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	170301000	USD
CY2010	us-gaap	Other Expenses OtherExpenses	980000	USD
CY2009	us-gaap	Other Expenses OtherExpenses	1230000	USD
CY2008	us-gaap	Other Expenses OtherExpenses	9139000	USD
CY2009Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	126832000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	193902000	USD
CY2008	us-gaap	Operating Income Loss OperatingIncomeLoss	55877000	USD
CY2009Q4	us-gaap	Other Assets Current OtherAssetsCurrent	27270000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	25571000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	787440000	USD
CY2009Q4	us-gaap	Liabilities Current LiabilitiesCurrent	644859000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	328811000	USD
CY2009Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	274489000	USD
CY2008	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	18053000	USD
CY2009	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	2916000	USD
CY2010	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	0	USD
CY2008	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-85798000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	110728000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	92424000	USD
CY2008	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	19694000	USD

Files In Submission

Name	View Source	Status
0001130464-11-000027-index-headers.html	Edgar Link	pending
0001130464-11-000027-index.html	Edgar Link	pending
0001130464-11-000027.txt	Edgar Link	pending
0001130464-11-000027-xbrl.zip	Edgar Link	pending
bkh-20101231.xml	Edgar Link	completed
bkh-20101231.xsd	Edgar Link	pending
bkh-20101231_cal.xml	Edgar Link	unprocessable
bkh-20101231_def.xml	Edgar Link	unprocessable
bkh-20101231_lab.xml	Edgar Link	unprocessable
bkh-20101231_pre.xml	Edgar Link	unprocessable
bkh10k123110.htm	Edgar Link	pending
bkhex21123110.htm	Edgar Link	pending
bkhex232123110.htm	Edgar Link	pending
bkhex311123110.htm	Edgar Link	pending
bkhex312123110.htm	Edgar Link	pending
bkhex321123110.htm	Edgar Link	pending
bkhex322123110.htm	Edgar Link	pending
defnref.xml	Edgar Link	unprocessable
exhibit1016.htm	Edgar Link	pending
exhibit104.htm	Edgar Link	pending
exhibit231.htm	Edgar Link	pending
exhibit99123110.htm	Edgar Link	pending
exhibt95.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.xml	Edgar Link	unprocessable
R10.xml	Edgar Link	unprocessable
R11.xml	Edgar Link	unprocessable
R12.xml	Edgar Link	unprocessable
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R7.xml	Edgar Link	unprocessable
R8.xml	Edgar Link	unprocessable
R9.xml	Edgar Link	unprocessable

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$BKH
BLACK HILLS CORP /SD/ Stock $bkh

2010 Form 10-K Financial Statement

#000113046411000027 Filed on February 25, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH BLACK HILLS CORP /SD/ Stock $bkh

2010 Form 10-K Financial Statement

#000113046411000027 Filed on February 25, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKH
BLACK HILLS CORP /SD/ Stock $bkh