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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Assets [Abstract]    
Capital loss carryforward $ 1,009us-gaap_DeferredTaxAssetsCapitalLossCarryforwards $ 1,008us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Intangibles 33,542us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 36,442us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Employee benefits and insurance claims accruals 12,146us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 9,332us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Accounts receivable reserve 908us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 501us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Employee stock-based compensation 8,440us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 8,905us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued expenses not deductible for tax purposes 1,391us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 749us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Accrued revenue not income for book purposes 429us-gaap_DeferredTaxAssetsDeferredIncome 942us-gaap_DeferredTaxAssetsDeferredIncome
Federal and state net operating loss and AMT credit carryforward 84,782pes_DeferredTaxAssetsFederalAndStateNetOperatingLossAndAlternativeMinimumTaxCreditCarryforward 94,605pes_DeferredTaxAssetsFederalAndStateNetOperatingLossAndAlternativeMinimumTaxCreditCarryforward
Foreign net operating loss carryforward 2,562us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 3,411us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Deferred Tax Assets, Gross 145,209us-gaap_DeferredTaxAssetsGross 155,895us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (1,504)us-gaap_DeferredTaxAssetsValuationAllowance (1,008)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 143,705us-gaap_DeferredTaxAssetsNet 154,887us-gaap_DeferredTaxAssetsNet
Components of Deferred Tax Liabilities [Abstract]    
Property and equipment 199,532us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 225,275us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities 199,532us-gaap_DeferredTaxLiabilities 225,275us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities $ 55,827us-gaap_DeferredTaxAssetsLiabilitiesNet $ 70,388us-gaap_DeferredTaxAssetsLiabilitiesNet