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Property and Equipment (PPE Schedule) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Building and improvements $ 170,420us-gaap_BuildingsAndImprovementsGross $ 161,805us-gaap_BuildingsAndImprovementsGross
Movable equipment 215,444amsg_MovableEquipmentGross 207,176amsg_MovableEquipmentGross
Construction in progress 11,940us-gaap_ConstructionInProgressGross 2,321us-gaap_ConstructionInProgressGross
Property and equipment, gross 397,804us-gaap_PropertyPlantAndEquipmentGross 371,302us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (217,356)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (207,612)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net $ 180,448us-gaap_PropertyPlantAndEquipmentNet $ 163,690us-gaap_PropertyPlantAndEquipmentNet