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COMMITMENTS AND CONTINGENCIES - Schedule of Long-term Purchase Commitment (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Long-term Purchase Commitment [Line Items] |
Total amounts committed | $ 69,688
2020 | 10,215
2021-2023 | 54,600
2024 | 2,595
After 5 years | 2,278
Long-term debt (includes interest) |
Long-term Purchase Commitment [Line Items] |
Total amounts committed | 3,922
2020 | 1,689
2021-2023 | 1,480
2024 | 335
After 5 years | 418
Finance leases (includes interest) |
Long-term Purchase Commitment [Line Items] |
Total amounts committed | 13,580
2020 | 4,610
2021-2023 | 8,449
2024 | 521
After 5 years | 0
Future equipment purchases |
Long-term Purchase Commitment [Line Items] |
Total amounts committed | 40,910
2020 | 1,750
2021-2023 | 39,160
2024 | 0
After 5 years | 0
Equipment service contracts |
Long-term Purchase Commitment [Line Items] |
Total amounts committed | 10,096
2020 | 1,847
2021-2023 | 4,655
2024 | 1,734
After 5 years | 1,860
Operating leases |
Long-term Purchase Commitment [Line Items] |
Total amounts committed | 1,180
2020 | 319
2021-2023 | 856
2024 | 5
After 5 years | $ 0

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- Definition Contractual Obligation, Due In Second, Third, And Fourth Year + References No definition available. + Details
Name: | ams_ContractualObligationDueInSecondThirdAndFourthYear
Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of contractual obligation due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |