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OBLIGATIONS UNDER CAPITAL LEASES (Details) (USD $)
Dec. 31, 2014
Capital Lease Obligations [Line Items]  
2015 $ 5,108,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016 4,783,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2017 4,282,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2018 2,714,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2019 1,415,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 380,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Total capital lease payments 18,682,000us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Less imputed interest 2,389,000us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Gross Minimum Lease Payments 16,293,000us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Less current portion 4,103,000us-gaap_CapitalLeasesFutureMinimumPaymentsRemainderOfFiscalYear
Net Minimum Lease Payments $ 12,190,000ams_CapitaLeasesFutureMinimumPaymentsNetMinimumPaymentsExcludingCurrentPortion