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
Mar. 31, 2020	Mar. 31, 2019
EARNINGS PER SHARE
Income from continuing operations	$ 18,398	$ 15,387
Income from continuing operations attributable to noncontrolling interest	15	8
Income from continuing operations attributable to Advanced Energy Industries, Inc.	$ 18,383	$ 15,379
Basic weighted-average common shares outstanding	38,358	38,198
Assumed exercise of dilutive stock options and restricted stock units	212	228
Diluted weighted-average common shares outstanding	38,570	38,426
Continuing Operations:
Basic earnings per share	$ 0.48	$ 0.40
Diluted earnings per share	$ 0.48	$ 0.40

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