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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary Of Employee Stock-Based Compensation Expense | Stock-based compensation expense - all related to employees and members of the Board of Directors - recognized under the authoritative guidance was as follows:
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
| (In thousands)
Selling, general and administrative | $ | 19,153 |  |  | $ | 18,721 |  |  | $ | 19,785 |
Research and development | 1,785 |  |  | 1,609 |  |  | 1,273 |
Cost of goods sold | 317 |  |  | 449 |  |  | 492 |
Total stock-based compensation expense | 21,255 |  |  | 20,779 |  |  | 21,550 |
Total estimated tax benefit related to stock-based compensation expense | 9,420 |  |  | 10,430 |  |  | 15,448 |
Net effect on net income | $ | 11,835 |  |  | $ | 10,349 |  |  | $ | 6,102 |
Summary Of Weighted-Average Assumptions | The following weighted-average assumptions were used in the calculation of fair value:
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
Dividend yield | 0% |  | 0% |  | 0%
Expected volatility | 28% |  | 28% |  | 30%
Risk free interest rate | 2.51% |  | 2.79% |  | 2.18%
Expected life of option from grant date | 7 years |  | 8 years |  | 8 years
Summary Of Stock Option Activity | The following table summarizes the Company’s stock option activity.
|  |  | Weighted Average Exercise Price |  | Weighted Average Contractual Term in Years |  | Aggregate Intrinsic Value
| Shares |  |  |
Stock Options | (In thousands) |  |  |  |  |  | (In thousands)
Outstanding at January 1, 2019 | 1,448 |  |  | $ | 27.91 |  |  | — |  |  | — |
Granted | 203 |  |  | 55.91 |  |  |  |  |
Exercised | (350 | ) |  | 17.83 |  |  |  |  |
Forfeited or Expired | (17 | ) |  | 46.52 |  |  |  |  |
Outstanding at December 31, 2019 | 1,284 |  |  | $ | 34.83 |  |  | 4.03 |  |  | $ | 30,128 |
Vested or expected to vest at December 31, 2019 | 1,284 |  |  | $ | 34.83 |  |  | 4.03 |  |  | $ | 30,128 |
Exercisable at December 31, 2019 | 961 |  |  | $ | 28.49 |  |  | 3.15 |  |  | $ | 28,639 |
Summary Of Restricted Stock, Performance Stock, and Contract Stock | The following table summarizes the Company’s awards of restricted stock, performance stock and contract stock for the year ended December 31, 2019.
| Restricted Stock Awards |  | Performance Stock and Contract Stock Awards
| Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Shares |  | Weighted Average Grant Date Fair Value Per Share
| (In thousands) |  |  |  | (In thousands) |  |
Unvested, January 1, 2019 | 417 |  |  | $ | 48.97 |  |  | 85 |  |  | 45.56 |
Granted | 303 |  |  | 55.41 |  |  | 157 |  |  | 55.86 |
Adjustments for performance achievement related to award target | — |  |  | — |  |  | 19 |  |  | 50.36 |
Cancellations | (59 | ) |  | 50.31 |  |  | (27 | ) |  | — |
Performance stock awards vested in 2018 and released in 2019 | — |  |  |  |  | 273 |  |  | 42.94 |
Released | (201 | ) |  | 46.08 |  |  | (175 | ) |  | 56.03 |
Vested but not released | — |  |  | — |  |  | (140 | ) |  | 50.36 |
Unvested, December 31, 2019 | 460 |  |  | $ | 54.31 |  |  | 192 |  |  | 55.38 |

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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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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