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SEGMENT INFORMATION - Schedule of Reportable Segments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) segment | Sep. 30, 2023 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | $ 909,291 | $ 892,997 | $ 2,734,802 | $ 2,648,970
Acquisition-related costs | 0 | 0 | (140) | (255)
Restructuring Initiatives | (3,864) | (6,161) | (9,659) | (19,628)
Curtailment gain related to restructuring initiatives | 1,851 | 0 | 1,851 | 0
Net unrealized investment (loss) gain | 1,043 | (5,428) | 1,495 | (2,349)
Depreciation and amortization | (67,015) | (62,686) | (196,332) | (184,212)
Interest Expense | (12,290) | (9,984) | (32,526) | (29,900)
Interest Income | 3,022 | 946 | 9,022 | 2,266
Income before Income Taxes | 131,131 | 110,049 | 353,695 | 294,196
Optimization initiative |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Restructuring Initiatives | (3,864) | (6,586) | (9,676) | (20,069)
Prior year initiatives |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Restructuring Initiatives | 0 | 425 | 17 | 441
Aptar Pharma |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 420,594 | 389,188 | 1,242,420 | 1,135,934
Aptar Beauty |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 302,859 | 323,980 | 951,666 | 979,956
Aptar Closures |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 185,838 | 179,829 | 540,716 | 533,080
Operating segment |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 917,032 | 901,452 | 2,762,563 | 2,678,225
Operating segment | Aptar Pharma |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 420,753 | 389,423 | 1,243,026 | 1,136,544
Adjusted EBITDA | 151,594 | 136,344 | 425,260 | 371,508
Restructuring Initiatives | (564) | (92) | (653) | (1,657)
Operating segment | Aptar Beauty |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 308,955 | 330,467 | 972,535 | 1,002,209
Adjusted EBITDA | 40,221 | 41,070 | 125,993 | 121,375
Restructuring Initiatives | (1,962) | (2,880) | (5,871) | (12,650)
Operating segment | Aptar Closures |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 187,324 | 181,562 | 547,002 | 539,472
Adjusted EBITDA | 31,980 | 27,607 | 86,259 | 81,387
Restructuring Initiatives | (877) | (3,098) | (2,530) | (4,060)
Intersegment |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 7,741 | 8,455 | 27,761 | 29,255
Intersegment | Aptar Pharma |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 159 | 235 | 606 | 610
Intersegment | Aptar Beauty |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 6,096 | 6,487 | 20,869 | 22,253
Intersegment | Aptar Closures |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Net Sales | 1,486 | 1,733 | 6,286 | 6,392
Corporate & Other, unallocated |  |  |  |
Financial information regarding the Company's reportable segments |  |  |  |
Adjusted EBITDA | (15,411) | (11,659) | (57,528) | (45,996)
Restructuring Initiatives | $ (461) | $ (91) | $ (605) | $ (1,261)

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