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OBLIGATIONS UNDER CAPITAL LEASES (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Capital Lease Obligations [Line Items]    
Description of Lessee Leasing Arrangements, Capital Leases payable in 60 to 84 monthly installments, and mature between July 2015 and May 2020.  
Maximum [Member]    
Capital Lease Obligations [Line Items]    
Capital Lease Obligation Interest Rate   9.50%ams_CapitalLeaseObligationInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum [Member]    
Capital Lease Obligations [Line Items]    
Capital Lease Obligation Interest Rate 5.15%ams_CapitalLeaseObligationInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Nine Obligations [Member]    
Capital Lease Obligations [Line Items]    
Capital Lease Obligations 18,279,000us-gaap_CapitalLeaseObligations
/ us-gaap_FairValueByLiabilityClassAxis
= ams_NineObligationsMember
20,680,000us-gaap_CapitalLeaseObligations
/ us-gaap_FairValueByLiabilityClassAxis
= ams_NineObligationsMember