BUSINESS ACQUISITIONS - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Business Acquisition, Pro Forma Information [Abstract]
Sales, net	$ 315,456	$ 140,743
Net income attributable to Advanced Energy Industries, Inc, As Reported	$ 18,063	$ 15,370
Earnings Per Share, Pro Forma [Abstract]
Basic earnings per share, As Reported	$ 0.47	$ 0.40
Diluted earnings per share	$ 0.47	$ 0.40
Artesyn's Embedded Power Business [Member]
Business Acquisition, Pro Forma Information [Abstract]
Sales, net	$ 153,900	$ 140,743
Total sales, Pro Forma		295,975
Net income attributable to Advanced Energy Industries, Inc, As Reported	$ (1,000)	15,370
Net income attributable to Advanced Energy Industries, Inc., Pro Forma		$ 21,544
Earnings Per Share, Pro Forma [Abstract]
Basic earnings per share, As Reported		$ 0.40
Basic earnings per share, Pro Forma		0.56
Diluted earnings per share		0.40
Diluted earnings per share, Pro Forma		$ 0.56

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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