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REVENUE - Nature of Goods and Services (Details) $ in Thousands	Mar. 31, 2021 USD ($) country	Dec. 31, 2020 USD ($)
REVENUE
Worldwide support organization maintained in number of countries | country	10
Deferred revenue | $	$ 8,340	$ 8,671

X

- Definition

Deferred Service Revenue

+ References

No definition available.

+ Details

Name:	aeis_DeferredServiceRevenue
Namespace Prefix:	aeis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration