BUSINESS ACQUISITIONS - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition, Pro Forma Information [Abstract]
Sales, net	$ 339,880	$ 134,810	$ 655,336	$ 275,553
Net income attributable to Advanced Energy Industries, Inc, As Reported	$ 29,144	$ 31,686	$ 47,207	$ 47,056
Earnings Per Share, Pro Forma [Abstract]
Basic earnings per share, As Reported	$ 0.76	$ 0.83	$ 1.23	$ 1.23
Diluted earnings per share	$ 0.76	$ 0.82	$ 1.23	$ 1.22
Artesyn's Embedded Power Business [Member]
Business Acquisition, Pro Forma Information [Abstract]
Sales, net	$ 159,800	$ 134,810	$ 313,700	$ 275,553
Total sales, Pro Forma		274,889		570,864
Net income attributable to Advanced Energy Industries, Inc, As Reported	$ (9,600)	31,686	$ (8,600)	47,056
Net income attributable to Advanced Energy Industries, Inc., Pro Forma		$ 25,336		$ 46,880
Earnings Per Share, Pro Forma [Abstract]
Basic earnings per share, As Reported		$ 0.83		$ 1.23
Basic earnings per share, Pro Forma		0.66		1.23
Diluted earnings per share		0.82		1.22
Diluted earnings per share, Pro Forma		$ 0.65		$ 1.22