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ACCOUNTING POLICIES (Details 2)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sales Revenue, Net [Member]      
Accounting Policies [Line Items]      
Break out, Percentage 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
Property, Plant and Equipment [Member]      
Accounting Policies [Line Items]      
Break out, Percentage 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember		  
Domestic [Member] | Sales Revenue, Net [Member]      
Accounting Policies [Line Items]      
Break out, Percentage 97.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= ams_DomesticMember		 91.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= ams_DomesticMember		 93.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= ams_DomesticMember
Domestic [Member] | Property, Plant and Equipment [Member]      
Accounting Policies [Line Items]      
Break out, Percentage 94.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= ams_DomesticMember		 84.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= ams_DomesticMember		  
Foreign [Member] | Sales Revenue, Net [Member]      
Accounting Policies [Line Items]      
Break out, Percentage 3.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= ams_ForeignMember		 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= ams_ForeignMember		 7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= ams_ForeignMember
Foreign [Member] | Property, Plant and Equipment [Member]      
Accounting Policies [Line Items]      
Break out, Percentage 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= ams_ForeignMember		 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= ams_ForeignMember