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ACQUISITIONS (Pro Forma) (Details) - CSP Technologies - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Unaudited pro forma financial information |  |
Net Sales | $ 687,201 | $ 2,172,737
Net Income Attributable to AptarGroup, Inc. | $ 48,034 | $ 158,527
Net Income per common share - basic | $ 0.77 | $ 2.54
Net Income per common share - diluted | $ 0.74 | $ 2.45

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