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BUSINESS ACQUISITIONS - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition, Pro Forma Information [Abstract]
Sales, net	$ 389,521	$ 175,127	$ 1,044,857	$ 450,680
Net income attributable to Advanced Energy Industries, Inc, As Reported	$ 45,627	$ 7,621	$ 92,834	$ 54,677
Earnings Per Share, Pro Forma [Abstract]
Basic earnings per share, As Reported	$ 1.19	$ 0.20	$ 2.42	$ 1.43
Diluted earnings per share	$ 1.19	$ 0.20	$ 2.41	$ 1.42
Artesyn's Embedded Power Business [Member]
Business Acquisition, Pro Forma Information [Abstract]
Sales, net	$ 188,800	$ 175,127	$ 502,500	$ 450,680
Total sales, Pro Forma		293,658		864,522
Net income attributable to Advanced Energy Industries, Inc, As Reported	$ 14,900	7,621	$ 23,500	54,677
Net income attributable to Advanced Energy Industries, Inc., Pro Forma		$ 12,577		$ 54,622
Earnings Per Share, Pro Forma [Abstract]
Basic earnings per share, As Reported		$ 0.20		$ 1.43
Basic earnings per share, Pro Forma		0.33		1.43
Diluted earnings per share		0.20		1.42
Diluted earnings per share, Pro Forma		$ 0.33		$ 1.42

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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