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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of option activity |
|  | Stock Awards Plans |  | Director Stock Option Plans |
|  |  |  |  | Weighted Average |  |  |  | Weighted Average |
|  |  | Options |  | Exercise Price |  | Options |  | Exercise Price |
Outstanding, January 1, 2018 |  |  | 8,059,319 |  | $ | 61.67 |  | 214,967 |  | $ | 57.44 |
Granted |  |  | 603,901 |  |  | 88.39 |  | — |  |  | — |
Exercised |  |  | (1,631,218) |  |  | 52.35 |  | (59,767) |  |  | 55.64 |
Forfeited or expired |  |  | (270,947) |  |  | 75.12 |  | — |  |  | — |
Outstanding at December 31, 2018 |  |  | 6,761,055 |  | $ | 65.76 |  | 155,200 |  | $ | 58.13 |
Exercisable at December 31, 2018 |  |  | 4,922,937 |  | $ | 61.08 |  | 155,200 |  | $ | 58.13 |
Weighted-Average Remaining Contractual Term (Years): |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 5.9 |  |  |  |  | 4.1 |  |  |  |
Exercisable at December 31, 2018 |  |  | 5.0 |  |  |  |  | 4.1 |  |  |  |
Aggregate Intrinsic Value: |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2018 |  | $ | 191,374 |  |  |  | $ | 5,577 |  |  |  |
Exercisable at December 31, 2018 |  | $ | 162,424 |  |  |  | $ | 5,577 |  |  |  |
Intrinsic Value of Options Exercised During the Years Ended: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  | $ | 72,951 |  |  |  | $ | 2,286 |  |  |  |
December 31, 2017 |  | $ | 51,140 |  |  |  | $ | 1,995 |  |  |  |
December 31, 2016 |  | $ | 44,972 |  |  |  | $ | 548 |  |  |  |
Weighted-average assumptions used to estimate fair value of restricted stock units |
Year Ended December 31, |  |  | 2018 |
Fair value per stock award |  | $ | 128.70 |
Grant date stock price |  | $ | 89.42 |
Assumptions: |  |  |  |
Aptar's stock price expected volatility |  |  | 12.30 | %
Expected average volatility of peer companies |  |  | 27.50 | %
Correlation assumption |  |  | 20.20 | %
Risk-free interest rate |  |  | 2.42 | %
Dividend yield assumption |  |  | 1.43 | %
Summary of restricted stock unit activity |
|  | Time-Based RSUs |  | Performance-Based RSUs |
|  |  |  | Weighted Average |  |  |  | Weighted Average |
|  | Units |  | Grant-Date Fair Value |  | Units |  | Grant-Date Fair Value |
Nonvested at January 1, 2018 |  | 124,067 |  | $ | 74.65 |  | — |  | $ | — |
Granted |  | 208,783 |  |  | 96.79 |  | 80,843 |  |  | 111.55 |
Vested |  | (39,691) |  |  | 75.09 |  | — |  |  | — |
Forfeited |  | (31,672) |  |  | 78.62 |  | (10,853) |  |  | 111.55 |
Nonvested at December 31, 2018 |  | 261,487 |  | $ | 91.78 |  | 69,990 |  | $ | 111.55 |
Stock Awards Plans |
Weighted-average assumptions used to estimate fair value of stock options granted |
Stock Awards Plans: |  |  |  |  |  |  |
Years Ended December 31, |  | 2018 |  | 2017 |  | 2016 |
Dividend Yield |  | 1.5 | % | 1.7 | % | 1.8 | %
Expected Stock Price Volatility |  | 14.2 | % | 15.8 | % | 16.9 | %
Risk-free Interest Rate |  | 2.8 | % | 2.2 | % | 1.6 | %
Expected Life of Option (years) |  | 6.6 |  | 6.7 |  | 6.7 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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