EARNINGS PER SHARE - Reconciliation of weighted-average shares outstanding used in calculation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
EARNINGS PER SHARE
Income from continuing operations	$ 44,811	$ 35,542	$ 81,673	$ 73,933
Less: income from continuing operations attributable to noncontrolling interest	21	31	7	64
Income from continuing operations attributable to Advanced Energy Industries, Inc.	$ 44,790	$ 35,511	$ 81,666	$ 73,869
Basic weighted-average common shares outstanding	37,520	38,389	37,535	38,359
Assumed exercise of dilutive stock options and restricted stock units	190	197	219	230
Diluted weighted-average common shares outstanding	37,710	38,586	37,754	38,589
Continuing operations:
Basic earnings per share	$ 1.19	$ 0.93	$ 2.18	$ 1.93
Diluted earnings per share	$ 1.19	$ 0.92	$ 2.16	$ 1.91