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DEFERRED COMPENSATION ARRANGEMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
DEFERRED COMPENSATION ARRANGEMENTS    
Amount accrued $ 2,167us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent $ 2,599us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Deferred compensation arrangements    
Amount accrued included in accrued liabilities 430us-gaap_DeferredCompensationLiabilityCurrent 0us-gaap_DeferredCompensationLiabilityCurrent
Supplemental Executive Retirement Plan    
Deferred compensation arrangements    
Amount that would be contributed to Supplemental Executive Retirement Plan in event of death, disability, or termination without cause for certain key executives $ 462amot_DeferredCompensationArrangementEmployerPotentialContribution
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember