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Income Taxes (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforwards $ 1,470,407us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 1,658,084us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Equity compensation 35,296us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 32,219us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred revenue 23,116us-gaap_DeferredTaxAssetsDeferredIncome 35,689us-gaap_DeferredTaxAssetsDeferredIncome
Tax credit and other attribute carryforwards 116,833us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 109,294us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Insurance loss reserve 6,235us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 4,645us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Accrued interest 227,572nbr_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedInterest 224,959nbr_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedInterest
Other 143,302us-gaap_DeferredTaxAssetsOther 162,678us-gaap_DeferredTaxAssetsOther
Subtotal 2,022,761us-gaap_DeferredTaxAssetsGross 2,227,568us-gaap_DeferredTaxAssetsGross
Valuation allowance (1,537,507)us-gaap_DeferredTaxAssetsValuationAllowance (1,547,441)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets 485,254us-gaap_DeferredTaxAssetsNet 680,127us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Depreciation, amortization and depletion for tax in excess of book expense 760,294nbr_DeferredTaxLiabilitiesDepreciationAmortizationAndDepletionForTaxInExcessOfBookExpense 967,689nbr_DeferredTaxLiabilitiesDepreciationAmortizationAndDepletionForTaxInExcessOfBookExpense
Variable interest investments 4,496nbr_DeferredTaxLiabilitiesVariableInterestInvestments 85,979nbr_DeferredTaxLiabilitiesVariableInterestInvestments
Other 17,953us-gaap_DeferredTaxLiabilitiesOther 17,890us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liability 782,743us-gaap_DeferredIncomeTaxLiabilities 1,071,558us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets (liabilities) (297,489)us-gaap_DeferredTaxLiabilities (391,431)us-gaap_DeferredTaxLiabilities
Balance Sheet Summary :    
Net current deferred asset 118,230us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 121,316us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Net noncurrent deferred asset 30,961us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 6,491us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net current deferred liability (3,677)us-gaap_DeferredTaxLiabilitiesCurrent (3,077)us-gaap_DeferredTaxLiabilitiesCurrent
Net noncurrent deferred liability (443,003)us-gaap_DeferredTaxLiabilitiesNoncurrent (516,161)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax assets (liabilities) $ (297,489)us-gaap_DeferredTaxLiabilities $ (391,431)us-gaap_DeferredTaxLiabilities