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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Interest Rate Swap [Member] - Cash Flow Hedge - Designated as Hedging Instrument [Member]	9 Months Ended
	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Loan value, percentage	85.00%
Annual interest (as a percent)	1.271%
Average fixed rate	0.521%
Basis points at current leverage ratios	75

X

- Definition

Basis points at current leverage ratios.

+ References

No definition available.

+ Details

Name:	aeis_BasisPointsAtCurrentLeverageRatios
Namespace Prefix:	aeis_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Portion of derivative amount representing percentage of term loan.

+ References

No definition available.

+ Details

Name:	aeis_DerivativeNotionalAmountRepresentsLoamValuePercentage
Namespace Prefix:	aeis_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

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

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: