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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
Current deferred tax assets:    
Credit carryforwards $ 365avca_DeferredTaxAssetsTaxCreditCarryforwardsCurrent $ 0avca_DeferredTaxAssetsTaxCreditCarryforwardsCurrent
Net operating loss and other carryforwards 0avca_DeferredTaxAssetsOperatingLossCarryforwardsCurrent 643avca_DeferredTaxAssetsOperatingLossCarryforwardsCurrent
Allowance for doubtful accounts 2,277avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsCurrent 1,788avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsCurrent
Accrued liabilities 5,386avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesCurrent 5,126avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesCurrent
Subtotal 8,028us-gaap_DeferredTaxAssetsGrossCurrent 7,557us-gaap_DeferredTaxAssetsGrossCurrent
Less valuation allowance (408)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (377)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total current deferred tax assets 7,620us-gaap_DeferredTaxAssetsNetCurrent 7,180us-gaap_DeferredTaxAssetsNetCurrent
Current deferred tax liabilities:    
Prepaid expenses (604)avca_DeferredTaxLiabilitiesPrepaidExpensesCurrent (601)avca_DeferredTaxLiabilitiesPrepaidExpensesCurrent
Net deferred tax assets, current 7,016us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 6,579us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Noncurrent deferred tax assets:    
Net operating loss and other carryforwards 1,174avca_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent 3,389avca_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent
Credit carryforwards 2,030avca_DeferredTaxAssetsTaxCreditCarryforwardsNoncurrent 2,210avca_DeferredTaxAssetsTaxCreditCarryforwardsNoncurrent
Deferred lease costs 230avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRentNoncurrent 289avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRentNoncurrent
Depreciation 355avca_DeferredTaxAssetsPropertyPlantAndEquipmentNoncurrent (634)avca_DeferredTaxAssetsPropertyPlantAndEquipmentNoncurrent
Tax goodwill and intangibles (978)avca_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsNoncurrent (879)avca_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsNoncurrent
Stock-based compensation 643avca_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCompensationCostNoncurrent 882avca_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCompensationCostNoncurrent
Accrued rent 3,786avca_DeferredTaxAssetsOtherNoncurrent 4,219avca_DeferredTaxAssetsOtherNoncurrent
Kansas acquisition costs 118avca_DeferredTaxAssetsAcquisitionCostsNoncurrent 125avca_DeferredTaxAssetsAcquisitionCostsNoncurrent
Impairment of long-lived assets 271avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLossesNoncurrent 472avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLossesNoncurrent
Interest rate swap 303avca_DeferredTaxAssetsDerivativeInstrumentsNoncurrent 349avca_DeferredTaxAssetsDerivativeInstrumentsNoncurrent
Noncurrent self-insurance liabilities 5,639avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsuranceNoncurrent 6,422avca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsuranceNoncurrent
Subtotal 13,571us-gaap_DeferredTaxAssetsGrossNoncurrent 16,844us-gaap_DeferredTaxAssetsGrossNoncurrent
Less valuation allowance (686)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (932)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total noncurrent deferred tax assets $ 12,885us-gaap_DeferredTaxAssetsNetNoncurrent $ 15,912us-gaap_DeferredTaxAssetsNetNoncurrent