Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aeis_ArtesynsEmbeddedPowerBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aeis_TrekHoldingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aeis_ElectrostaticProductLineMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aeis_LumaSenseTechnologyHoldingsInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TechnologyEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Business Acquisitions - Schedule of Intangible Assets Acquired, Amortization Method, and Estimated Useful Lives (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019
Business Acquisition [Line Items]
Amortizable intangible assets:		$ 45,428
Artesyn's Embedded Power Business [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:			$ 124
Trek Holding [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		788
Electrostatic Product Line [Member] [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		1,400
LumaSense Technology Holdings Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		$ 43,240	43,240
Technology Equipment [Member] \| Minimum
Business Acquisition [Line Items]
Useful Life		10 years
Technology Equipment [Member] \| Maximum
Business Acquisition [Line Items]
Useful Life		15 years
Technology Equipment [Member] \| Artesyn's Embedded Power Business [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:			28
Useful Life	5 years
Technology Equipment [Member] \| Trek Holding [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		$ 671
Technology Equipment [Member] \| Electrostatic Product Line [Member] [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		1,200
Technology Equipment [Member] \| LumaSense Technology Holdings Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		$ 35,530
Customer Relationships [Member]
Business Acquisition [Line Items]
Useful Life		10 years
Customer Relationships [Member] \| Artesyn's Embedded Power Business [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:			75
Useful Life	15 years
Customer Relationships [Member] \| Trek Holding [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		$ 117
Customer Relationships [Member] \| Electrostatic Product Line [Member] [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		200
Customer Relationships [Member] \| LumaSense Technology Holdings Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		$ 4,360
Tradename [Member]
Business Acquisition [Line Items]
Useful Life		10 years
Tradename [Member] \| Artesyn's Embedded Power Business [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:			$ 21
Useful Life	10 years
Tradename [Member] \| LumaSense Technology Holdings Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:		$ 3,350