$UNTC
Unit Corp Stock $untc

$untc Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000079894913000006 Filed on February 26, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$347.3M	$322.2M	$287.8M
YoY Change	37.51%	47.75%	40.68%
Cost Of Revenue	$251.1M	$227.9M	$202.0M
YoY Change	43.4%	46.47%	38.36%
Gross Profit	$96.19M	$94.31M	$85.78M
YoY Change	24.85%	50.89%	46.38%
Gross Profit Margin	27.69%	29.27%	29.8%
Selling, General & Admin	$7.900M	$7.800M	$7.500M
YoY Change	16.18%	18.18%	15.38%
% of Gross Profit	8.21%	8.27%	8.74%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$78.60M	$72.40M	$67.90M
YoY Change	26.37%	37.64%	44.47%
% of Gross Profit	81.71%	76.77%	79.16%
Operating Expenses	$7.900M	$7.100M	$7.500M
YoY Change	16.18%	5.97%	15.38%
Operating Profit	$88.29M	$96.58M	$89.16M
YoY Change	25.69%	52.41%	66.66%
Interest Expense	-$3.500M		-$700.0K
YoY Change
% of Operating Profit	-3.96%		-0.79%
Other Income/Expense, Net	-$300.0K	-$667.0K	$282.0K
YoY Change
Pretax Income	$84.50M	$86.76M	$81.28M
YoY Change	19.52%	55.21%	56.0%
Income Tax	$32.90M	$33.40M	$31.46M
% Of Pretax Income	38.93%	38.5%	38.7%
Net Earnings	$51.66M	$53.36M	$49.82M
YoY Change	18.22%	54.67%	54.72%
Net Earnings / Revenue	14.87%	16.56%	17.31%
Basic Earnings Per Share	$1.08	$1.12	$1.05
Diluted Earnings Per Share	$1.08	$1.11	$1.04
COMMON SHARES
Basic Shares Outstanding		47.69M shares	47.66M shares
Diluted Shares Outstanding		47.97M shares	47.98M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$800.0K	$1.200M	$1.200M
YoY Change	-42.86%	9.09%	-33.33%
Cash & Equivalents	$835.0K	$1.160M	$1.223M
Short-Term Investments
Other Short-Term Assets	$54.20M	$61.00M	$23.50M
YoY Change	115.94%	62.67%	-47.43%
Inventory	$8.200M	$8.100M	$6.800M
Prepaid Expenses
Receivables	$165.3M	$153.8M	$139.1M
Other Receivables	$0.00	$11.90M	$19.20M
Total Short-Term Assets	$228.5M	$236.0M	$189.8M
YoY Change	21.39%	49.18%	21.36%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.942B	$2.822B	$2.641B
YoY Change	22.61%	22.83%	19.12%
Goodwill	$62.81M
YoY Change
Intangibles	$1.855M
YoY Change
Long-Term Investments
YoY Change
Other Assets	$11.08M	$42.00M	$21.70M
YoY Change	-28.54%	84.21%	0.46%
Total Long-Term Assets	$3.028B	$2.929B	$2.728B
YoY Change	22.06%	22.73%	18.32%
TOTAL ASSETS
Total Short-Term Assets	$228.5M	$236.0M	$189.8M
Total Long-Term Assets	$3.028B	$2.929B	$2.728B
Total Assets	$3.257B	$3.165B	$2.918B
YoY Change	22.01%	24.38%	18.52%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$143.3M	$105.5M	$88.60M
YoY Change	59.41%	60.58%	46.45%
Accrued Expenses	$51.73M	$60.60M	$35.30M
YoY Change	71.87%	42.92%	2.02%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$212.8M	$178.1M	$146.1M
YoY Change	44.63%	45.15%	33.79%
LONG-TERM LIABILITIES
Long-Term Debt	$300.0M	$305.4M	$250.0M
YoY Change	84.05%	126.22%	92.31%
Other Long-Term Liabilities	$113.8M	$112.7M	$94.60M
YoY Change	23.19%	24.12%	15.09%
Total Long-Term Liabilities	$413.8M	$418.1M	$344.6M
YoY Change	62.03%	85.16%	62.39%
TOTAL LIABILITIES
Total Short-Term Liabilities	$212.8M	$178.1M	$146.1M
Total Long-Term Liabilities	$413.8M	$418.1M	$344.6M
Total Liabilities	$626.6M	$1.255B	$1.104B
YoY Change	-34.64%	45.57%	37.08%
SHAREHOLDERS EQUITY
Retained Earnings	$1.510B
YoY Change
Common Stock	$9.541M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.947B	$1.910B	$1.813B
YoY Change
Total Liabilities & Shareholders Equity	$3.257B	$3.165B	$2.918B
YoY Change	22.01%	24.38%	18.52%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$51.66M	$53.36M	$49.82M
YoY Change	18.22%	54.67%	54.72%
Depreciation, Depletion And Amortization	$78.60M	$72.40M	$67.90M
YoY Change	26.37%	37.64%	44.47%
Cash From Operating Activities	$190.6M	$158.4M	$138.3M
YoY Change	79.47%	49.29%	40.98%
INVESTING ACTIVITIES
Capital Expenditures	$187.0M	$238.1M	$183.8M
YoY Change	-22.25%	101.27%	64.25%
Acquisitions
YoY Change
Other Investing Activities	$2.500M	$6.200M	$1.100M
YoY Change	-97.45%	264.71%	-101.4%
Cash From Investing Activities	-$184.4M	-$231.9M	-$182.7M
YoY Change	29.4%	99.06%	-4.04%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-6.400M	73.40M	44.40M
YoY Change	-117.53%	648.98%	-52.21%
NET CHANGE
Cash From Operating Activities	190.6M	158.4M	138.3M
Cash From Investing Activities	-184.4M	-231.9M	-182.7M
Cash From Financing Activities	-6.400M	73.40M	44.40M
Net Change In Cash	-200.0K	-100.0K	0.000
YoY Change	-200.0%	-83.33%	-100.0%
FREE CASH FLOW
Cash From Operating Activities	$190.6M	$158.4M	$138.3M
Capital Expenditures	$187.0M	$238.1M	$183.8M
Free Cash Flow	$3.600M	-$79.70M	-$45.50M
YoY Change	-102.68%	553.28%	229.71%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	138811000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	143311000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	165276000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	146046000	USD
CY2011	us-gaap	Accretion Expense AccretionExpense	3838000	USD
CY2010	us-gaap	Accretion Expense AccretionExpense	2937000	USD
CY2012	us-gaap	Accretion Expense AccretionExpense	4615000	USD
CY2010	us-gaap	Accretion Of Discount AccretionOfDiscount	77536000	USD
CY2011	us-gaap	Accretion Of Discount AccretionOfDiscount	128492000	USD
CY2012	us-gaap	Accretion Of Discount AccretionOfDiscount	157842000	USD
CY2012Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	24632000	USD
CY2011Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	22518000	USD
CY2011Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	781000	USD
CY2012Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2012Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	53162000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	51733000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2907660000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2319484000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	19026000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	7587000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	423603000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	408109000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10000000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10800000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11400000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5343000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5343000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1200000	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2600000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1200000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	146159000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	96446000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	69265000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	4615000	USD
CY2010Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	2738093000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3838000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	2953000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	3040000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	56650000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	15068000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2788000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1009000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	7506000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-9284000	USD
CY2012Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	143206000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	93406000	USD
CY2012Q4	us-gaap	Assets Assets	3761120000	USD
CY2011Q4	us-gaap	Assets Assets	3256720000	USD
CY2010Q4	us-gaap	Assets Assets	2669240000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	195644000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	228465000	USD
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	1.75
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	4.81
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	1.74
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	4.78
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	4800000	USD
CY2011Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	5700000	USD
CY2010Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	6500000	USD
CY2011	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	229272000	USD
CY2012	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	83940000	USD
CY2011	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1336227000	USD
CY2012	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1376393000	USD
CY2011Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	1724312000	USD
CY2010Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	1542352000	USD
CY2012Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	2216787000	USD
CY2012Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	521659000	USD
CY2011Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	3487664000	USD
CY2012Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	4344040000	USD
CY2010Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	2913158000	USD
CY2012Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	2127253000	USD
CY2011Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1763352000	USD
CY2010Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1370806000	USD
CY2011Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3302032000	USD
CY2012Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3822381000	USD
CY2010Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	175065000	USD
CY2011Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	185632000	USD
CY2012Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	521659000	USD
CY2010Q4	us-gaap	Capitalized Costs Wells And Related Equipment And Facilities CapitalizedCostsWellsAndRelatedEquipmentAndFacilities	13400000	USD
CY2012Q4	us-gaap	Capitalized Costs Wells And Related Equipment And Facilities CapitalizedCostsWellsAndRelatedEquipmentAndFacilities	17600000	USD
CY2011Q4	us-gaap	Capitalized Costs Wells And Related Equipment And Facilities CapitalizedCostsWellsAndRelatedEquipmentAndFacilities	15600000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	835000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	974000	USD
CY2010Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1140000	USD
CY2011Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1359000	USD
CY2012Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	835000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1359000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-524000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	219000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	139000	USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.2
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.2
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	48151442	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	48581948	shares
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	9594000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	9541000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	11737000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	221744000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	135175000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	644624000	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	885202000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	1260462000	USD
CY2010	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	50000000	USD
CY2011	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	50013000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	225669000	USD
CY2010	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	75739000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	420467000	USD
CY2011	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	70999000	USD
CY2012	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	390649000	USD
CY2011	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	391862000	USD
CY2010	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	279903000	USD
CY2010	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	48304000	USD
CY2012	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	46467000	USD
CY2011	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	43836000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-6856000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2084000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3159000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	696000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-9935000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2416000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-1388000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	743000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-3079000	USD
CY2012Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	936000	USD
CY2011Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	2055000	USD
CY2012Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	650000000	USD
CY2011Q2	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	250000000	USD
CY2011Q2	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.06625
CY2012Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.06625
CY2012Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.06625
CY2012	us-gaap	Debt Instrument Interest Rate Terms DebtInstrumentInterestRateTerms	LIBOR plus 1.00%
CY2012Q3	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2021-05-15
CY2011Q2	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2021-05-15
CY2012	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2021-05-15
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4700000	USD
CY2012	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	-112359000	USD
CY2010	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	-120000	USD
CY2011	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	-29000	USD
CY2012Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	2779000	USD
CY2011Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	2463000	USD
CY2011Q4	us-gaap	Deferred Costs DeferredCosts	5671000	USD
CY2012Q4	us-gaap	Deferred Costs DeferredCosts	13432000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	13768000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	109363000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	88021000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	125551000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	100672000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	15530000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1762000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	12651000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	16188000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	101059000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	132882000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	8765000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	10936000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	56020000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	47683000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	1972000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	0	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	672187000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	687011000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	695776000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	683123000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	205124000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	319021000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	280451000	USD
CY2011Q4	us-gaap	Derivative Assets DerivativeAssets	36452000	USD
CY2012Q4	us-gaap	Derivative Assets DerivativeAssets	16552000	USD
CY2012Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	16552000	USD
CY2011Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	31938000	USD
CY2012Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	14000000	USD
CY2012Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	0	USD
CY2011Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	4514000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Reclassification From Accumulated Oci To Income Estimate Of Time To Transfer1 DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1	P0Y12M
CY2012	us-gaap	Derivative Instruments Gain Loss Reclassification From Accumulated Oci To Income Estimated Net Amount To Be Transferred DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred	7600000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	51853000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	2965000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	2749000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	-2616000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	19026000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	7587000	USD
CY2012	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-1243000	USD
CY2010	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	1036000	USD
CY2011	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	1702000	USD
CY2012	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Loss DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss	1373000	USD
CY2011	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Loss DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss	-1047000	USD
CY2011Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	2657000	USD
CY2012Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	2510000	USD
CY2012Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1948000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	2657000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	0	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	562000	USD
CY2012	us-gaap	Derivative Maturity Dates DerivativeMaturityDates	2013-12-31
CY2010	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves10 Percent Annual Discount For Estimated Timing Of Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves10PercentAnnualDiscountForEstimatedTimingOfCashFlows	-732918000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves10 Percent Annual Discount For Estimated Timing Of Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves10PercentAnnualDiscountForEstimatedTimingOfCashFlows	-924136000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves10 Percent Annual Discount For Estimated Timing Of Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves10PercentAnnualDiscountForEstimatedTimingOfCashFlows	-842430000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Standardized Measure DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure	-1079956000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Standardized Measure DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure	-1087909000	USD
CY2010	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Standardized Measure DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure	-855086000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.10
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.11
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.08
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.12
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.40
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.86
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.10
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.18
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.09
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.08
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.09
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.08
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.11
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.04
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.40
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.86
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.18
CY2011	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	-595000	USD
CY2011	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	174859000	USD
CY2010	us-gaap	Gas Gathering Transportation Marketing And Processing Revenue GasGatheringTransportationMarketingAndProcessingRevenue	154516000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2500000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2700000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2700000	USD
CY2012Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	11300000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P0Y9M18D
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4500000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4100000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3900000	USD
CY2012	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	432058000	USD
CY2011	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	401134000	USD
CY2010	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	340771000	USD
CY2011Q4	us-gaap	Fair Value Concentration Of Risk Cash And Cash Equivalents FairValueConcentrationOfRiskCashAndCashEquivalents	31100000	USD
CY2012Q4	us-gaap	Fair Value Concentration Of Risk Cash And Cash Equivalents FairValueConcentrationOfRiskCashAndCashEquivalents	40400000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	17300000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	16100000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	700000	USD
CY2011	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	-1688000	USD
CY2010	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	-433000	USD
CY2012	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	1608000	USD
CY2010	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	9687000	USD
CY2012	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	253000	USD
CY2012	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	187292000	USD
CY2010	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	122146000	USD
CY2012	us-gaap	Gas Gathering Transportation Marketing And Processing Revenue GasGatheringTransportationMarketingAndProcessingRevenue	217460000	USD
CY2011	us-gaap	Gas Gathering Transportation Marketing And Processing Revenue GasGatheringTransportationMarketingAndProcessingRevenue	208238000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	26152000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	33086000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	30055000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	62808000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	62808000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	319002000	USD
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2011	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2010	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2012	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2010	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2011	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2012Q1	us-gaap	Gross Profit GrossProfit	95912000	USD
CY2012Q2	us-gaap	Gross Profit GrossProfit	-22253000	USD
CY2011Q4	us-gaap	Gross Profit GrossProfit	96192000	USD
CY2012Q3	us-gaap	Gross Profit GrossProfit	95921000	USD
CY2011Q1	us-gaap	Gross Profit GrossProfit	76078000	USD
CY2011Q3	us-gaap	Gross Profit GrossProfit	94306000	USD
CY2012Q4	us-gaap	Gross Profit GrossProfit	-81833000	USD
CY2011Q2	us-gaap	Gross Profit GrossProfit	85780000	USD
CY2012	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2010	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2011	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2012Q4	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	1200000	USD
CY2012	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	1200000	USD
CY2012	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	283606000	USD
CY2011	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2010	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2012Q4	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	167700000	USD
CY2012Q2	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	115900000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	39402000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	237221000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	123135000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	90737000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16226000	USD
CY2011	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	9245000	USD
CY2012	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	6911000	USD
CY2010	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-3555000	USD
CY2012	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	51587000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	111651000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	83027000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	13791000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	2543000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	1351000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	1680000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1084000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6030000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	8941000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3143000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5116000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	655000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	901000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	10187000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-1064000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-8913000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	58965000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	38731000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-13994000	USD
CY2010	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	15974000	USD
CY2011	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	37742000	USD
CY2012	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	94678000	USD
CY2010	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-200815000	USD
CY2011	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-60675000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1886000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	361000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-598000	USD
CY2012	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-1119000	USD
CY2010	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-542000	USD
CY2011	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-527000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	3466000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-6957000	USD
CY2011	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	58567000	USD
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1855000	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	680000	USD
CY2010	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	42280000	USD
CY2012	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	283774000	USD
CY2010	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	0	USD
CY2011	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-22672000	USD
CY2012	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-14137000	USD
CY2011	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-4167000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	159257000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	146408000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	0	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	14880000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	3470000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2647000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	6568000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	8563000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	8202000	USD
CY2012	us-gaap	Lease Expiration Date1 LeaseExpirationDate1	2017-09-01
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3761120000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3256720000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	212750000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	207139000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.027
CY2012Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.029
CY2011Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	750000000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	900000000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	645300000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	250000000	USD
CY2011Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	250600000	USD
CY2012Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	687700000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	716359000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	300000000	USD
CY2012Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	37728000	USD
CY2011Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	34118000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	388270000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1079042000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-768236000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-536261000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	690911000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	390072000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	608455000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	23176000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	195867000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	146484000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	-56547000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	46586000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	53360000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	-19302000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	41027000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	51661000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	49819000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	52439000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	195867000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	-20171000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	-19987000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	4892000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	146484000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	23176000	USD
CY2011	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	115852000	USD
CY2010	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	379097000	USD
CY2012	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-321099000	USD
CY2012	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	150212000	USD
CY2010	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	105365000	USD
CY2011	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	131271000	USD
CY2011	us-gaap	Oil And Gas Revenue OilAndGasRevenue	514614000	USD
CY2010	us-gaap	Oil And Gas Revenue OilAndGasRevenue	399771000	USD
CY2012	us-gaap	Oil And Gas Revenue OilAndGasRevenue	567944000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	87747000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	252199000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	352356000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	8400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	100000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	300000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	600000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	3300000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	7100000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	14000000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	8500000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	138600000	USD
CY2012	us-gaap	Operating Loss Carryforwards Expiration Dates OperatingLossCarryforwardsExpirationDates	2015 to 2032
CY2012Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	3591000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	3898000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	11334000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	11076000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	25877000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11309000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11439000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-31682000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-32268000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-1819000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	762381000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	484080000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	11961000	USD
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	69000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	18635000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	29384000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11174000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3299000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	-1146000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-15259000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	386274000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	21392000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	12094000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	18412000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	13254000	USD
CY2011	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	1333000	USD
CY2010	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	976000	USD
CY2012	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	2279000	USD
CY2010	us-gaap	Other Income OtherIncome	10138000	USD
CY2011	us-gaap	Other Income OtherIncome	-834000	USD
CY2012	us-gaap	Other Income OtherIncome	121000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	179265000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	126043000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	12282000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	12213000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	166983000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	113830000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-781000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-294000	USD
CY2011Q2	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	6000000	USD
CY2012Q3	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	8700000	USD
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	92229000	USD
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	598485000	USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	50013000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	728551000	USD
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	11278000	USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	13843000	USD
CY2010	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	45327000	USD
CY2011	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	45327000	USD
CY2012	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	104377000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	243950000	USD
CY2010	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	286900000	USD
CY2012	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	714200000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	149000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	215000	USD
CY2012	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	735300000	USD
CY2011	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	441500000	USD
CY2011Q2	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	244000000	USD
CY2012	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	-19440000	USD
CY2011	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	26454000	USD
CY2010	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	13219000	USD
CY2010	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	40048000	USD
CY2012	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	281824000	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	10328000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	679000	USD
CY2012Q4	us-gaap	Productive Gas Wells Number Of Wells Gross ProductiveGasWellsNumberOfWellsGross	23	Unit
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5261815000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	6384882000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3477222000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2942331000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	37544000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	62840000	USD
CY2012	us-gaap	Provision For Other Losses ProvisionForOtherLosses	90000	USD
CY2011	us-gaap	Provision For Other Losses ProvisionForOtherLosses	260000	USD
CY2010	us-gaap	Provision For Other Losses ProvisionForOtherLosses	0	USD
CY2011	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	554500000	USD
CY2010	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	153900000	USD
CY2011Q2	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	220300000	USD
CY2011	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	181960000	USD
CY2012	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	492475000	USD
CY2010	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	117793000	USD
CY2012	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-39328000	USD
CY2010	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	113183000	USD
CY2011	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	127767000	USD
CY2012	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	131389000	USD
CY2011	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	115400000	USD
CY2010	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	91143000	USD
CY2010	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	392229000	USD
CY2011	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	505450000	USD
CY2012	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	557003000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1510341000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1533517000	USD
CY2011	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	484651000	USD
CY2012	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	529719000	USD
CY2010	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	316384000	USD
CY2011	us-gaap	Revenues Revenues	1207503000	USD
CY2010	us-gaap	Revenues Revenues	870671000	USD
CY2012	us-gaap	Revenues Revenues	1315123000	USD
CY2012Q1	us-gaap	Revenues Revenues	333966000	USD
CY2012Q4	us-gaap	Revenues Revenues	331582000	USD
CY2011Q4	us-gaap	Revenues Revenues	347341000	USD
CY2012Q2	us-gaap	Revenues Revenues	327785000	USD
CY2011Q1	us-gaap	Revenues Revenues	250096000	USD
CY2011Q2	us-gaap	Revenues Revenues	287829000	USD
CY2012Q3	us-gaap	Revenues Revenues	321790000	USD
CY2011Q3	us-gaap	Revenues Revenues	322237000	USD
CY2012	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	49600000	USD
CY2011	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	52200000	USD
CY2010	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	40100000	USD
CY2012	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-148648000	USD
CY2011	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-38336000	USD
CY2010	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-67116000	USD
CY2012	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	-425626000	USD
CY2010	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	-301086000	USD
CY2011	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	-389339000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1710617000	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	614133	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	3300000	shares
CY2010Q1	us-gaap	Stockholders Equity StockholdersEquity	1565810000	USD
CY2010Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	24504	shares
CY2011Q4	us-gaap	Senior Notes SeniorNotes	250000000	USD
CY2012Q4	us-gaap	Senior Notes SeniorNotes	645259000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	16956000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	10067000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	14303000	USD
CY2012	us-gaap	Tax Benefit From Stock Options Exercised1 TaxBenefitFromStockOptionsExercised1	121000	USD
CY2010	us-gaap	Tax Benefit From Stock Options Exercised1 TaxBenefitFromStockOptionsExercised1	40000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1947017000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1974301000	USD
CY2012	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-124537000	USD
CY2011	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-65912000	USD
CY2010	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-23097000	USD
CY2011	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	232823000	USD
CY2012	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	-7953000	USD
CY2010	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	308751000	USD
CY2012Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1079956000	USD
CY2011Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1087909000	USD
CY2010Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	855086000	USD
CY2009Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	546335000	USD
CY2012	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	15547000	USD
CY2011	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	14656000	USD
CY2010	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	9632000	USD
CY2012	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	430506000	shares
CY2010	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	379762000	shares
CY2011	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	241011000	shares
CY2011	us-gaap	Tax Benefit From Stock Options Exercised1 TaxBenefitFromStockOptionsExercised1	1174000	USD
CY2011Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	13480000	USD
CY2012Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	7308000	USD
CY2012Q4	us-gaap	Temporary Equity Redemption Price Per Share TemporaryEquityRedemptionPricePerShare	0.01
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	1036000	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-1243000	USD
CY2010	unt	Capital Expenditure Gas Gathering And Processing CapitalExpenditureGasGatheringAndProcessing	29815000	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	2413000	USD
CY2012	unt	Capital Expenditure Gas Gathering And Processing CapitalExpenditureGasGatheringAndProcessing	183162000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></div></div>
CY2011Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5343000	USD
CY2009Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5186000	USD
CY2010Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5083000	USD
CY2012Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5343000	USD
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	260000	USD
CY2012	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	90000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	0	USD
CY2012	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	90000	USD
CY2011	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	0	USD
CY2010	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	103000	USD
CY2010	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	176000	shares
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	245000	shares
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	293000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47454000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47951000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48154000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47278000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47658000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47909000	shares
CY2012Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	18517000	USD
CY2011Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	17026000	USD
CY2011Q4	unt	Accrued Hedge Settlements AccruedHedgeSettlements	1844000	USD
CY2012Q4	unt	Accrued Hedge Settlements AccruedHedgeSettlements	160000	USD
CY2011Q4	unt	Accrued Oil And Gas Production Expense Current AccruedOilAndGasProductionExpenseCurrent	7346000	USD
CY2012Q4	unt	Accrued Oil And Gas Production Expense Current AccruedOilAndGasProductionExpenseCurrent	10903000	USD
CY2012Q4	unt	Amount Remaining Towards Gas Treating Plant AmountRemainingTowardsGasTreatingPlant	1800000	USD
CY2012	unt	Asset Retirement Obligation Liabilities Sold AssetRetirementObligationLiabilitiesSold	1258000	USD
CY2011	unt	Asset Retirement Obligation Liabilities Sold AssetRetirementObligationLiabilitiesSold	0	USD
CY2012Q4	unt	Book Overdrafts BookOverdrafts	7000000	USD
CY2011Q4	unt	Book Overdrafts BookOverdrafts	26500000	USD
CY2011	unt	Capital Expenditure Contract Drilling CapitalExpenditureContractDrilling	162208000	USD
CY2010	unt	Capital Expenditure Contract Drilling CapitalExpenditureContractDrilling	118806000	USD
CY2012	unt	Capital Expenditure Contract Drilling CapitalExpenditureContractDrilling	77520000	USD
CY2011	unt	Capital Expenditure Gas Gathering And Processing CapitalExpenditureGasGatheringAndProcessing	79355000	USD
CY2011	unt	Capital Expenditure Oil And Natural Gas CapitalExpenditureOilAndNaturalGas	580055000	USD
CY2012	unt	Capital Expenditure Oil And Natural Gas CapitalExpenditureOilAndNaturalGas	1128349000	USD
CY2010	unt	Capital Expenditure Oil And Natural Gas CapitalExpenditureOilAndNaturalGas	463870000	USD
CY2012	unt	Change In Net Income Dilutive ChangeInNetIncomeDilutive	0	USD
CY2011	unt	Change In Net Income Dilutive ChangeInNetIncomeDilutive	0	USD
CY2012Q4	unt	Gas Gathering And Processing Identifiable Assets GasGatheringAndProcessingIdentifiableAssets	413708000	USD
CY2010	unt	Change In Net Income Dilutive ChangeInNetIncomeDilutive	0	USD
CY2010	unt	Minimum Salary For Employees To Participate In Oil And Gas Partnership MinimumSalaryForEmployeesToParticipateInOilAndGasPartnership	36000	USD
CY2012	unt	Contract Drilling Fees ContractDrillingFees	246000	USD
CY2010	unt	Change In Other Comprehensive Income Tax ChangeInOtherComprehensiveIncomeTax	-7000000	USD
CY2012	unt	Change In Other Comprehensive Income Tax ChangeInOtherComprehensiveIncomeTax	-7069000	USD
CY2011	unt	Change In Other Comprehensive Income Tax ChangeInOtherComprehensiveIncomeTax	16205000	USD
CY2012	unt	Commitment Fee Under Credit Facility Standard CommitmentFeeUnderCreditFacilityStandard	0.01
CY2011	unt	Contract Drilling Depreciation ContractDrillingDepreciation	79667000	USD
CY2010	unt	Contract Drilling Depreciation ContractDrillingDepreciation	69970000	USD
CY2012	unt	Contract Drilling Depreciation ContractDrillingDepreciation	81007000	USD
CY2011	unt	Contract Drilling Expenses ContractDrillingExpenses	269899000	USD
CY2012	unt	Contract Drilling Expenses ContractDrillingExpenses	289524000	USD
CY2010	unt	Contract Drilling Expenses ContractDrillingExpenses	186813000	USD
CY2010	unt	Contract Drilling Fees ContractDrillingFees	529000	USD
CY2011	unt	Contract Drilling Fees ContractDrillingFees	352000	USD
CY2010	unt	Contract Drilling Identifiable Assets ContractDrillingIdentifiableAssets	998658000	USD
CY2012	unt	Contract Drilling Identifiable Assets ContractDrillingIdentifiableAssets	1079736000	USD
CY2011	unt	Contract Drilling Identifiable Assets ContractDrillingIdentifiableAssets	1118666000	USD
CY2010	unt	Contract Drilling Operating Income Loss ContractDrillingOperatingIncomeLoss	-59601000	USD
CY2011	unt	Contract Drilling Operating Income Loss ContractDrillingOperatingIncomeLoss	-135085000	USD
CY2012	unt	Contract Drilling Operating Income Loss ContractDrillingOperatingIncomeLoss	-159188000	USD
CY2010	unt	Contract Drilling Revenues ContractDrillingRevenues	316384000	USD
CY2012	unt	Contract Drilling Revenues ContractDrillingRevenues	529719000	USD
CY2011	unt	Contract Drilling Revenues ContractDrillingRevenues	484651000	USD
CY2012	unt	Contract Drilling Revenues Gross ContractDrillingRevenuesGross	579368000	USD
CY2010	unt	Contract Drilling Revenues Gross ContractDrillingRevenuesGross	356527000	USD
CY2011	unt	Contract Drilling Revenues Gross ContractDrillingRevenuesGross	536872000	USD
CY2012	unt	Corporate Assets CorporateAssets	53647000	USD
CY2010	unt	Corporate Assets CorporateAssets	52189000	USD
CY2011	unt	Corporate Assets CorporateAssets	69799000	USD
CY2012	unt	Costs Incurred In Asset Retirement Obligation CostsIncurredInAssetRetirementObligation	45097000	USD
CY2010	unt	Costs Incurred In Asset Retirement Obligation CostsIncurredInAssetRetirementObligation	9924000	USD
CY2011	unt	Costs Incurred In Asset Retirement Obligation CostsIncurredInAssetRetirementObligation	23345000	USD
CY2012	unt	Current Ratio Of Credit Facility CurrentRatioOfCreditFacility	1 to 1
CY2012Q3	unt	Debt Instrument Issued At Discount Percent Of Par DebtInstrumentIssuedAtDiscountPercentOfPar	0.9875
CY2012	unt	Debt Instrument Variable Interest Rate Payable Assessment Period DebtInstrumentVariableInterestRatePayableAssessmentPeriod	P90D
CY2012Q4	unt	Deferred Tax Assets Tax Deferred Expense Allowance For Losses And Nondeductible Accruals DeferredTaxAssetsTaxDeferredExpenseAllowanceForLossesAndNondeductibleAccruals	74890000	USD
CY2011Q4	unt	Deferred Tax Assets Tax Deferred Expense Allowance For Losses And Nondeductible Accruals DeferredTaxAssetsTaxDeferredExpenseAllowanceForLossesAndNondeductibleAccruals	53376000	USD
CY2012Q4	unt	Deferred Tax Liability Depreciation Depletion Amortization And Impairment DeferredTaxLiabilityDepreciationDepletionAmortizationAndImpairment	819893000	USD
CY2011Q4	unt	Deferred Tax Liability Depreciation Depletion Amortization And Impairment DeferredTaxLiabilityDepreciationDepletionAmortizationAndImpairment	773246000	USD
CY2011	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureNetCashFlows	2012045000	USD
CY2012	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureNetCashFlows	1922386000	USD
CY2012Q4	unt	Drilling Equipment DrillingEquipment	1478645000	USD
CY2011	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionCosts	1277856000	USD
CY2011Q4	unt	Drilling Equipment DrillingEquipment	1423570000	USD
CY2012Q4	unt	Effects Of Cash Flow Hedges Used In Calculating Ceiling Limitation Amount EffectsOfCashFlowHedgesUsedInCalculatingCeilingLimitationAmount	29800000	USD
CY2010	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionCosts	1054630000	USD
CY2012Q4	unt	Natural Gas Gathering Systems And Treating Plants NaturalGasGatheringSystemsAndTreatingPlants	461629000	USD
CY2012	unt	Eliminated Associated Operating Expense EliminatedAssociatedOperatingExpense	34100000	USD
CY2011	unt	Eliminated Yielding EliminatedYielding	19600000	USD
CY2012	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionCosts	1405773000	USD
CY2011Q4	unt	Natural Gas Gathering Systems And Treating Plants NaturalGasGatheringSystemsAndTreatingPlants	278919000	USD
CY2010	unt	Non Cash Additions To Oil And Natural Gas Properties Related To Asset Retirement Obligations NonCashAdditionsToOilAndNaturalGasPropertiesRelatedToAssetRetirementObligations	9924000	USD
CY2012	unt	Eliminated Yielding EliminatedYielding	15500000	USD
CY2010	unt	Eliminated Yielding EliminatedYielding	9100000	USD
CY2011Q4	unt	Gas Balancing Liability GasBalancingLiability	3263000	USD
CY2012Q4	unt	Gas Balancing Liability GasBalancingLiability	3838000	USD
CY2012	unt	Non Cash Additions To Oil And Natural Gas Properties Related To Asset Retirement Obligations NonCashAdditionsToOilAndNaturalGasPropertiesRelatedToAssetRetirementObligations	45097000	USD
CY2012Q2	unt	Effects Of Cash Flow Hedges Used In Calculating Ceiling Limitation Amount EffectsOfCashFlowHedgesUsedInCalculatingCeilingLimitationAmount	32500000	USD
CY2011	unt	Eliminated Associated Operating Expense EliminatedAssociatedOperatingExpense	32600000	USD
CY2010	unt	Eliminated Associated Operating Expense EliminatedAssociatedOperatingExpense	31000000	USD
CY2012	unt	Elimination Of Inter Segment Revenue Of Contract Drilling EliminationOfInterSegmentRevenueOfContractDrilling	49649000	USD
CY2010	unt	Elimination Of Inter Segment Revenue Of Contract Drilling EliminationOfInterSegmentRevenueOfContractDrilling	40143000	USD
CY2011	unt	Elimination Of Inter Segment Revenue Of Contract Drilling EliminationOfInterSegmentRevenueOfContractDrilling	52221000	USD
CY2010	unt	Elimination Of Inter Segment Revenue Of Gas Gathering And Processing EliminationOfInterSegmentRevenueOfGasGatheringAndProcessing	46804000	USD
CY2012	unt	Elimination Of Inter Segment Revenue Of Gas Gathering And Processing EliminationOfInterSegmentRevenueOfGasGatheringAndProcessing	73313000	USD
CY2011	unt	Elimination Of Inter Segment Revenue Of Gas Gathering And Processing EliminationOfInterSegmentRevenueOfGasGatheringAndProcessing	76010000	USD
CY2012Q4	unt	Employee Service Share Based Compensation Allocation Of Unrecognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfUnrecognizedPeriodCostsCapitalizedAmount	2100000	USD
CY2012	unt	Employment Contract Period Extension Years EmploymentContractPeriodExtensionYears	1	Y
CY2012	unt	Equal Redemption Price Percentage Of Principal Amount Of Debt EqualRedemptionPricePercentageOfPrincipalAmountOfDebt	1.00
CY2012Q4	unt	Estimated Annual Payments Long Term Debt And Other Liabilities Due In Next Twelve Months EstimatedAnnualPaymentsLongTermDebtAndOtherLiabilitiesDueInNextTwelveMonths	12300000	USD
CY2012Q4	unt	Estimated Annual Payments Long Term Debt And Other Liabilities Due In Year Five EstimatedAnnualPaymentsLongTermDebtAndOtherLiabilitiesDueInYearFive	4200000	USD
CY2012Q4	unt	Estimated Annual Payments Long Term Debt And Other Liabilities Due In Year Four EstimatedAnnualPaymentsLongTermDebtAndOtherLiabilitiesDueInYearFour	74900000	USD
CY2012Q4	unt	Estimated Annual Payments Long Term Debt And Other Liabilities Due In Year Three EstimatedAnnualPaymentsLongTermDebtAndOtherLiabilitiesDueInYearThree	44400000	USD
CY2012Q4	unt	Estimated Annual Payments Long Term Debt And Other Liabilities Due In Year Two EstimatedAnnualPaymentsLongTermDebtAndOtherLiabilitiesDueInYearTwo	4400000	USD
CY2010	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureCashInflows	3745046000	USD
CY2012	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureCashInflows	4522351000	USD
CY2011	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureCashInflows	4583629000	USD
CY2011	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureDevelopmentCosts	340992000	USD
CY2010	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureDevelopmentCosts	303152000	USD
CY2012	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureDevelopmentCosts	431673000	USD
CY2010	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureIncomeTaxExpense	799260000	USD
CY2012	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureIncomeTaxExpense	762519000	USD
CY2011	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureIncomeTaxExpense	952736000	USD
CY2010	unt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureNetCashFlows	1588004000	USD
CY2010Q4	unt	Gas Gathering And Processing Identifiable Assets GasGatheringAndProcessingIdentifiableAssets	176596000	USD
CY2011Q4	unt	Gas Gathering And Processing Identifiable Assets GasGatheringAndProcessingIdentifiableAssets	247763000	USD
CY2010	unt	Gas Gathering And Processing Operating Income Loss GasGatheringAndProcessingOperatingIncomeLoss	-16985000	USD
CY2012	unt	Gas Gathering And Processing Operating Income Loss GasGatheringAndProcessingOperatingIncomeLoss	-5780000	USD
CY2011	unt	Gas Gathering And Processing Operating Income Loss GasGatheringAndProcessingOperatingIncomeLoss	-17278000	USD
CY2012	unt	Gas Gathering Transportation Marketing And Processing Depreciation GasGatheringTransportationMarketingAndProcessingDepreciation	24388000	USD
CY2010	unt	Gas Gathering Transportation Marketing And Processing Depreciation GasGatheringTransportationMarketingAndProcessingDepreciation	15385000	USD
CY2011	unt	Non Cash Additions To Oil And Natural Gas Properties Related To Asset Retirement Obligations NonCashAdditionsToOilAndNaturalGasPropertiesRelatedToAssetRetirementObligations	23345000	USD
CY2012Q4	unt	Non Cash Ceiling Test Write Down Net Of Tax NonCashCeilingTestWriteDownNetOfTax	104400000	USD
CY2011	unt	Gas Gathering Transportation Marketing And Processing Depreciation Amortization And Impairment GasGatheringTransportationMarketingAndProcessingDepreciationAmortizationAndImpairment	16101000	USD
CY2012Q2	unt	Non Cash Ceiling Test Write Down Net Of Tax NonCashCeilingTestWriteDownNetOfTax	72100000	USD
CY2012Q2	unt	Non Cash Write Down Of Oil And Natural Gas Properties NonCashWriteDownOfOilAndNaturalGasProperties	115900000	USD
CY2010	unt	Gas Gathering Transportation Marketing And Processing Depreciation Amortization And Impairment GasGatheringTransportationMarketingAndProcessingDepreciationAmortizationAndImpairment	15385000	USD
CY2010	unt	Gas Gathering And Processing Revenue Gross GasGatheringAndProcessingRevenueGross	201320000	USD
CY2012	unt	Gas Gathering And Processing Revenue Gross GasGatheringAndProcessingRevenueGross	290773000	USD
CY2011	unt	Gas Gathering And Processing Revenue Gross GasGatheringAndProcessingRevenueGross	284248000	USD
CY2012Q4	unt	Non Cash Write Down Of Oil And Natural Gas Properties NonCashWriteDownOfOilAndNaturalGasProperties	167700000	USD
CY2012	unt	Gas Gathering Transportation Marketing And Processing Depreciation Amortization And Impairment GasGatheringTransportationMarketingAndProcessingDepreciationAmortizationAndImpairment	24388000	USD
CY2011	unt	General And Administrative Expense Reimbursement GeneralAndAdministrativeExpenseReimbursement	610000	USD
CY2012Q2	unt	Non Cash Write Down Of Oil And Natural Gas Properties Net Of Tax NonCashWriteDownOfOilAndNaturalGasPropertiesNetOfTax	72100000	USD
CY2010	unt	General And Administrative Expense Reimbursement GeneralAndAdministrativeExpenseReimbursement	536000	USD
CY2012	unt	Results Of Operations Oil And Gas Income Before Income Taxes ResultsOfOperationsOilAndGasIncomeBeforeIncomeTaxes	-66861000	USD
CY2011	unt	Results Of Operations Oil And Gas Income Before Income Taxes ResultsOfOperationsOilAndGasIncomeBeforeIncomeTaxes	208090000	USD
CY2011	unt	Gas Gathering Transportation Marketing And Processing Depreciation GasGatheringTransportationMarketingAndProcessingDepreciation	16101000	USD
CY2012	unt	General And Administrative Expense Reimbursement GeneralAndAdministrativeExpenseReimbursement	39000	USD
CY2012	unt	Grace Period Following First Anniversary GracePeriodFollowingFirstAnniversary	30	D
CY2012	unt	Impairment Of Oil And Gas Properties Current ImpairmentOfOilAndGasPropertiesCurrent	283606000	USD
CY2010	unt	Impairment Of Oil And Gas Properties Current ImpairmentOfOilAndGasPropertiesCurrent	0	USD
CY2011	unt	Impairment Of Oil And Gas Properties Current ImpairmentOfOilAndGasPropertiesCurrent	0	USD
CY2011	unt	Income From Operations IncomeFromOperations	322301000	USD
CY2012	unt	Income From Operations IncomeFromOperations	54661000	USD
CY2010	unt	Income From Operations IncomeFromOperations	226047000	USD
CY2012	unt	Increasedecreaseinaccountspayablerelatedtopurchasesofpropertyplantandequipment Increasedecreaseinaccountspayablerelatedtopurchasesofpropertyplantandequipment	-4753000	USD
CY2011	unt	Increasedecreaseinaccountspayablerelatedtopurchasesofpropertyplantandequipment Increasedecreaseinaccountspayablerelatedtopurchasesofpropertyplantandequipment	-28036000	USD
CY2010	unt	Increasedecreaseinaccountspayablerelatedtopurchasesofpropertyplantandequipment Increasedecreaseinaccountspayablerelatedtopurchasesofpropertyplantandequipment	-29700000	USD
CY2012	unt	Incremental Per Share Effect Of Dilutive Income Changes Over Dilutive Share Changes IncrementalPerShareEffectOfDilutiveIncomeChangesOverDilutiveShareChanges	0.00
CY2010	unt	Incremental Per Share Effect Of Dilutive Income Changes Over Dilutive Share Changes IncrementalPerShareEffectOfDilutiveIncomeChangesOverDilutiveShareChanges	-0.01
CY2011	unt	Incremental Per Share Effect Of Dilutive Income Changes Over Dilutive Share Changes IncrementalPerShareEffectOfDilutiveIncomeChangesOverDilutiveShareChanges	-0.03
CY2012	unt	Leverage Ratio Of Long Term Debt To Consolidated Ebitda LeverageRatioOfLongTermDebtToConsolidatedEbitda	4 to 1
CY2012	unt	Percentage Of Annual Discount For Estimated Timing Of Cash Flows PercentageOfAnnualDiscountForEstimatedTimingOfCashFlows	0.10
CY2012Q4	unt	Loan Origination Fees LoanOriginationFees	1500000	USD
CY2012	unt	Minimum Depreciation Percentage For Drilling Rigs MinimumDepreciationPercentageForDrillingRigs	0.20
CY2012	unt	Minimum Percentage Of Common Stock That Should Be Acquired For Shareholder Rights Plan To Be Exercisable MinimumPercentageOfCommonStockThatShouldBeAcquiredForShareholderRightsPlanToBeExercisable	0.15
CY2012	unt	Minimum Redemption Percentage Of Debt Outstanding MinimumRedemptionPercentageOfDebtOutstanding	0.65
CY2010	unt	Results Of Operations Oil And Gas Income Before Income Taxes ResultsOfOperationsOilAndGasIncomeBeforeIncomeTaxes	183293000	USD
CY2010	unt	Percentage Of Annual Discount For Estimated Timing Of Cash Flows PercentageOfAnnualDiscountForEstimatedTimingOfCashFlows	0.10
CY2011	unt	Percentage Of Annual Discount For Estimated Timing Of Cash Flows PercentageOfAnnualDiscountForEstimatedTimingOfCashFlows	0.10
CY2012	unt	Percentage Of Fair Value Of Common Stock That Can Be Acquired PercentageOfFairValueOfCommonStockThatCanBeAcquired	0.50
CY2011	unt	Minimum Salary For Employees To Participate In Oil And Gas Partnership MinimumSalaryForEmployeesToParticipateInOilAndGasPartnership	36000	USD
CY2012	unt	Percentage Of Maximum Aggregate Principal Equity Amount PercentageOfMaximumAggregatePrincipalEquityAmount	0.35
CY2012	unt	Results Of Operations Oil And Gas Income Tax Expense ResultsOfOperationsOilAndGasIncomeTaxExpense	-27533000	USD
CY2011Q4	unt	Oil And Natural Gas Properties Full Cost Method Subject To Amortization OilAndNaturalGasPropertiesFullCostMethodSubjectToAmortization	3302032000	USD
CY2012Q4	unt	Oil And Natural Gas Properties Full Cost Method Subject To Amortization OilAndNaturalGasPropertiesFullCostMethodSubjectToAmortization	3822381000	USD
CY2012Q4	unt	Non Cash Write Down Of Oil And Natural Gas Properties Net Of Tax NonCashWriteDownOfOilAndNaturalGasPropertiesNetOfTax	104400000	USD
CY2011	unt	Results Of Operations Oil And Gas Income Tax Expense ResultsOfOperationsOilAndGasIncomeTaxExpense	80323000	USD
CY2012	unt	Other Capital Expenditure OtherCapitalExpenditure	28071000	USD
CY2010	unt	Other Capital Expenditure OtherCapitalExpenditure	6417000	USD
CY2011	unt	Other Capital Expenditure OtherCapitalExpenditure	10791000	USD
CY2012Q4	unt	Outstanding Borrowings Subject To Libor OutstandingBorrowingsSubjectToLibor	-71100000	USD
CY2011Q4	unt	Outstanding Borrowings Subject To Libor OutstandingBorrowingsSubjectToLibor	-50000000	USD
CY2010	unt	Results Of Operations Oil And Gas Income Tax Expense ResultsOfOperationsOilAndGasIncomeTaxExpense	70110000	USD
CY2012	unt	Right Of Common Stock RightOfCommonStock	one
CY2012	unt	Number Of Contracts Daywork NumberOfContractsDaywork	27
CY2010Q2	unt	Number Of Directors Receiving Options NumberOfDirectorsReceivingOptions	8
CY2012	unt	Number Of Oil And Gas Limited Partnerships NumberOfOilAndGasLimitedPartnerships	16	Unit
CY2012	unt	Number Of Oil And Gas Limited Partnerships For Employee Investment NumberOfOilAndGasLimitedPartnershipsForEmployeeInvestment	13	Unit
CY2012	unt	Number Of Oil And Gas Limited Partnerships For Third Party Investment NumberOfOilAndGasLimitedPartnershipsForThirdPartyInvestment	3	Unit
CY2012Q4	unt	Number Of Partnerships NumberOfPartnerships	16	Unit
CY2010	unt	Oil And Gas Properties Average Depreciation Depletion And Amortization Rate OilAndGasPropertiesAverageDepreciationDepletionAndAmortizationRate	11.94	USD
CY2012	unt	Oil And Gas Properties Average Depreciation Depletion And Amortization Rate OilAndGasPropertiesAverageDepreciationDepletionAndAmortizationRate	14.70	USD
CY2011	unt	Oil And Gas Properties Average Depreciation Depletion And Amortization Rate OilAndGasPropertiesAverageDepreciationDepletionAndAmortizationRate	15.06	USD
CY2012	unt	Oil And Gas Property Full Cost Method Discount Percentage OilAndGasPropertyFullCostMethodDiscountPercentage	0.10
CY2011	unt	Oil And Natural Gas Depreciation Depletion And Amortization OilAndNaturalGasDepreciationDepletionAndAmortization	183350000	USD
CY2012	unt	Oil And Natural Gas Depreciation Depletion And Amortization OilAndNaturalGasDepreciationDepletionAndAmortization	211347000	USD
CY2010	unt	Oil And Natural Gas Depreciation Depletion And Amortization OilAndNaturalGasDepreciationDepletionAndAmortization	118793000	USD
CY2011	unt	Oil And Natural Gas Identifiable Assets OilAndNaturalGasIdentifiableAssets	1820492000	USD
CY2012	unt	Oil And Natural Gas Identifiable Assets OilAndNaturalGasIdentifiableAssets	2214029000	USD
CY2010	unt	Oil And Natural Gas Identifiable Assets OilAndNaturalGasIdentifiableAssets	1441797000	USD
CY2011	unt	Oil And Natural Gas Operating Income Loss OilAndNaturalGasOperatingIncomeLoss	-199993000	USD
CY2012	unt	Oil And Natural Gas Operating Income Loss OilAndNaturalGasOperatingIncomeLoss	77221000	USD
CY2010	unt	Oil And Natural Gas Operating Income Loss OilAndNaturalGasOperatingIncomeLoss	-175613000	USD
CY2011Q4	unt	Oil And Natural Gas Properties Full Cost Method Not Subject To Amortization OilAndNaturalGasPropertiesFullCostMethodNotSubjectToAmortization	185632000	USD
CY2012Q4	unt	Oil And Natural Gas Properties Full Cost Method Not Subject To Amortization OilAndNaturalGasPropertiesFullCostMethodNotSubjectToAmortization	521659000	USD
CY2012	unt	Percentage Of Repurchase Of Limited Units Outstanding PercentageOfRepurchaseOfLimitedUnitsOutstanding	0.20
CY2012	unt	Performance Evaluation Period PerformanceEvaluationPeriod	P3Y
CY2012	unt	Proceed From Equity Offerings Redemption Price Percentage ProceedFromEquityOfferingsRedemptionPricePercentage	1.06625
CY2011	unt	Repurchase Of Limited Units Outstanding Amount RepurchaseOfLimitedUnitsOutstandingAmount	22000	USD
CY2010	unt	Repurchase Of Limited Units Outstanding Amount RepurchaseOfLimitedUnitsOutstandingAmount	22000	USD
CY2012	unt	Repurchase Of Limited Units Outstanding Amount RepurchaseOfLimitedUnitsOutstandingAmount	56000	USD
CY2012	unt	Senior Notes Repurchase Price In Percentage SeniorNotesRepurchasePriceInPercentage	1.01
CY2011	unt	Separation Benefit Plans Expense SeparationBenefitPlansExpense	1900000	USD
CY2011Q4	unt	Separation Benefit Plans Liability SeparationBenefitPlansLiability	6845000	USD
CY2010	unt	Separation Benefit Plans Expense SeparationBenefitPlansExpense	1600000	USD
CY2012	unt	Separation Benefit Plans Expense SeparationBenefitPlansExpense	2200000	USD
CY2012Q4	unt	Separation Benefit Plans Liability SeparationBenefitPlansLiability	7972000	USD
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Trading Symbol TradingSymbol	unt
CY2010Q2	unt	Share Based Compensation Arrangement By Share Based Payment Award Contingent Options ShareBasedCompensationArrangementByShareBasedPaymentAwardContingentOptions	3063	shares
CY2012	unt	Shareholder Rights Plan Expiration Date ShareholderRightsPlanExpirationDate	May 19, 2015
CY2012	unt	Tax On Gain Loss On Cash Flow Hedge Ineffectiveness TaxOnGainLossOnCashFlowHedgeIneffectiveness	1008000	USD
CY2011	unt	Tax On Gain Loss On Cash Flow Hedge Ineffectiveness TaxOnGainLossOnCashFlowHedgeIneffectiveness	-1061000	USD
CY2010	unt	Tax On Gain Loss On Cash Flow Hedge Ineffectiveness TaxOnGainLossOnCashFlowHedgeIneffectiveness	-267000	USD
CY2012	unt	Term Of Agreement Period TermOfAgreementPeriod	5	Y
CY2010	unt	Total Capital Expenditures TotalCapitalExpenditures	618908000	USD
CY2011	unt	Total Capital Expenditures TotalCapitalExpenditures	832409000	USD
CY2012	unt	Total Capital Expenditures TotalCapitalExpenditures	1417102000	USD
CY2010	unt	Total Depreciation Depletion Amortization And Impairment TotalDepreciationDepletionAmortizationAndImpairment	205124000	USD
CY2011	unt	Total Depreciation Depletion Amortization And Impairment TotalDepreciationDepletionAmortizationAndImpairment	280451000	USD
CY2012	unt	Total Depreciation Depletion Amortization And Impairment TotalDepreciationDepletionAmortizationAndImpairment	602627000	USD
CY2012	unt	Total Identifiable Assets TotalIdentifiableAssets	3707473000	USD
CY2011	unt	Total Identifiable Assets TotalIdentifiableAssets	3186921000	USD
CY2010	unt	Total Identifiable Assets TotalIdentifiableAssets	2617051000	USD
CY2012	unt	Undeveloped Leasehold Acquired And Wells In Progress UndevelopedLeaseholdAcquiredAndWellsInProgress	428375000	USD
CY2011	unt	Undeveloped Leasehold Acquired And Wells In Progress UndevelopedLeaseholdAcquiredAndWellsInProgress	62750000	USD
CY2009	unt	Undeveloped Leasehold Acquired And Wells In Progress UndevelopedLeaseholdAcquiredAndWellsInProgress	10559000	USD
CY2010	unt	Undeveloped Leasehold Acquired And Wells In Progress UndevelopedLeaseholdAcquiredAndWellsInProgress	19975000	USD
CY2012	unt	Vesting Period For Shareholder Rights Plan VestingPeriodForShareholderRightsPlan	10	D
CY2011	unt	Well Supervision And Other Fees WellSupervisionAndOtherFees	396000	USD
CY2010	unt	Well Supervision And Other Fees WellSupervisionAndOtherFees	386000	USD
CY2012	unt	Well Supervision And Other Fees WellSupervisionAndOtherFees	434000	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000798949
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	49158255	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	1089162162	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	UNIT CORP
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No

Files In Submission

Name	View Source	Status
0000798949-13-000006-index-headers.html	Edgar Link	pending
0000798949-13-000006-index.html	Edgar Link	pending
0000798949-13-000006.txt	Edgar Link	pending
0000798949-13-000006-xbrl.zip	Edgar Link	pending
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$UNTC
Unit Corp Stock $untc

2011 Q4 Form 10-K Financial Statement

#000079894913000006 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$UNTC Unit Corp Stock $untc

2011 Q4 Form 10-K Financial Statement

#000079894913000006 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$UNTC
Unit Corp Stock $untc