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ACQUISITIONS (Pro Forma) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Mega Airless | Acquisition Related Costs |  |  |
Acquisitions |  |  |
Transaction costs excluded from supplemental pro forma earnings (after tax) |  |  | $ 4,200
Transaction costs excluded from supplemental pro forma earnings (before tax) |  |  | 5,600
Mega Airless | Fair Value Adjustment |  |  |
Acquisitions |  |  |
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro forma earnings (after tax) |  |  | 1,700
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro form earnings (before tax) |  |  | 2,600
CSP Technologies Member |  |  |
Unaudited pro forma financial information |  |  |
Net Sales | $ 2,857,765 | $ 2,605,095 | 2,340,000
Net Income Attributable to AptarGroup, Inc. | $ 208,717 | $ 230,753 | $ 213,000
Net Income per common share - basic | $ 3.34 | $ 3.70 | $ 3.39
Net Income per common share - diluted | $ 3.21 | $ 3.57 | $ 3.29
CSP Technologies Member | Acquisition Related Costs |  |  |
Acquisitions |  |  |
Transaction costs excluded from supplemental pro forma earnings (after tax) | $ 16,700 |  |
Transaction costs excluded from supplemental pro forma earnings (before tax) | 22,000 |  |
CSP Technologies Member | Fair Value Adjustment |  |  |
Acquisitions |  |  |
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro forma earnings (after tax) | 10,900 |  |
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory excluded from supplemental pro form earnings (before tax) | $ 14,100 |  |

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