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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current deferred tax assets    
Provisions not currently deductible $ 7,234arii_DeferredTaxAssetsProvisionsNotCurrentlyDeductibleCurrent $ 8,962arii_DeferredTaxAssetsProvisionsNotCurrentlyDeductibleCurrent
Tax credits and deferred revenues 246arii_DeferredTaxAssetsTaxCreditsAndDeferredRevenues 74arii_DeferredTaxAssetsTaxCreditsAndDeferredRevenues
Net operating loss —state 208us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 24us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Total current deferred tax asset 7,688us-gaap_DeferredTaxAssetsGrossCurrent 9,060us-gaap_DeferredTaxAssetsGrossCurrent
Non-current deferred tax assets    
Provisions not currently deductible 392arii_DeferredTaxAssetsProvisionsNotCurrentlyDeductibleNonCurrent 308arii_DeferredTaxAssetsProvisionsNotCurrentlyDeductibleNonCurrent
Stock based compensation 136us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 270us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss carryforwards—federal and state 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 189us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Net capital loss carryforwards—federal and state 1,859us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 1,988us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Pensions and post retirement 3,095arii_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndPostretirementBenefits 1,603arii_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndPostretirementBenefits
Deferred Tax Assets, Gross, Noncurrent 5,482us-gaap_DeferredTaxAssetsGrossNoncurrent 4,358us-gaap_DeferredTaxAssetsGrossNoncurrent
Total deferred tax asset 13,170us-gaap_DeferredTaxAssetsNet 13,418us-gaap_DeferredTaxAssetsNet
Non-current deferred tax liabilities    
Investment in joint ventures/partnerships (2,269)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (2,294)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Property, plant and equipment (171,562)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (101,276)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liability $ (173,831)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent $ (103,570)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent