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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
EARNINGS PER SHARE
Income from continuing operations	$ 29,279	$ 23,373	$ 47,677	$ 38,760
Income (loss) from continuing operations attributable to noncontrolling interest	(16)	11	(1)	19
Income from continuing operations attributable to Advanced Energy Industries, Inc.	$ 29,295	$ 23,362	$ 47,678	$ 38,741
Basic weighted-average common shares outstanding	38,294	38,274	38,326	38,236
Assumed exercise of dilutive stock options and restricted stock units	164	188	199	207
Diluted weighted-average common shares outstanding	38,458	38,462	38,525	38,443
Continuing Operations:
Basic earnings per share	$ 0.77	$ 0.61	$ 1.24	$ 1.01
Diluted earnings per share	$ 0.76	$ 0.61	$ 1.24	$ 1.01

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