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COMMITMENTS AND CONTINGENCIES (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014
Commitments And Contingencies [Line Items] |
Long-term Purchase Commitment, Amount | $ 45,434,000 us-gaap_LongTermPurchaseCommitmentAmount
Long Term Purchase Commitment Deposits For Future Purchase | 7,784,000 ams_LongTermPurchaseCommitmentDepositsForFuturePurchase
Long-term Purchase Commitment, Additional Amount | $ 9,000,000 ams_LongtermPurchaseCommitmentAdditionalAmount
Long Term Purchase Commitment Due Discription | Approximately $27,000,000 of these commitments are not expected to start becoming due until 2016.

X
- Details
Name: | ams_CommitmentsAndContingenciesLineItems
Namespace Prefix: | ams_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The addtional amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | ams_LongtermPurchaseCommitmentAdditionalAmount
Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Deposits for purchase of commitments in future. + References No definition available. + Details
Name: | ams_LongTermPurchaseCommitmentDepositsForFuturePurchase
Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the commitments due date of expectation. + References No definition available. + Details
Name: | ams_LongTermPurchaseCommitmentDueDiscription
Namespace Prefix: | ams_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration