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	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share
Income from continuing operations	$ 7,256	$ 35,157	$ 46,016	$ 127,927
Income from continuing operations attributable to noncontrolling interest	10	7	29	82
Income from continuing operations attributable to Advanced Energy Industries, Inc.	$ 7,246	$ 35,150	$ 45,987	$ 127,845
Basic weighted-average common shares outstanding	38,313	38,970	38,258	39,309
Assumed exercise of dilutive stock options and restricted stock units	176	225	199	285
Diluted weighted-average common shares outstanding	38,489	39,195	38,457	39,594
Continuing Operations:
Basic earnings per share	$ 0.19	$ 0.90	$ 1.20	$ 3.25
Diluted earnings per share	$ 0.19	$ 0.90	$ 1.20	$ 3.23

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