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v2.4.1.9

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

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