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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Selling, general and administrative | $ | 19,785 |  |  | $ | 15,829 |  |  | $ | 14,461 |
Research and development | 1,273 |  |  | 1,048 |  |  | 714 |
Cost of goods sold | 492 |  |  | 433 |  |  | 275 |
Total stock-based compensation expense | 21,550 |  |  | 17,310 |  |  | 15,450 |
Total estimated tax benefit related to stock-based compensation expense | 15,448 |  |  | 10,569 |  |  | 5,792 |
Net effect on net income | $ | 6,102 |  |  | $ | 6,741 |  |  | $ | 9,658 |
Summary Of Weighted-Average Assumptions | The following weighted-average assumptions were used in the calculation of fair value:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Dividend yield | 0% |  | 0% |  | 0%
Expected volatility | 30% |  | 29% |  | 29%
Risk free interest rate | 2.18% |  | 1.94% |  | 1.96%
Expected life of option from grant date | 8 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, 2017 | 2,083 |  |  | $ | 20.65 |  |  |  |  |
Granted | 187 |  |  | 41.72 |  |  |  |  |
Exercised | (531 | ) |  | 17.60 |  |  |  |  |
Forfeited or Expired | — |  |  | — |  |  |  |  |
Outstanding at December 31, 2017 | 1,739 |  |  | $ | 23.84 |  |  | 3.54 |  | $ | 41,753 |
Vested or expected to vest at December 31, 2017 | 1,739 |  |  | $ | 23.84 |  |  | 3.54 |  | $ | 41,753 |
Exercisable at December 31, 2017 | 1,333 |  |  | $ | 19.95 |  |  | 2.63 |  | $ | 37,208 |
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, 2017.
|  |  |  |  | Performance Stock and Contract Stock Awards
| Restricted 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, 2017 | 512 |  |  | $ | 28.49 |  |  | 345 |  |  | $ | 21.62 |
Granted | 286 |  |  | 44.15 |  |  | 213 |  |  | 43.75 |
Adjustments for performance achievement related to award target | — |  |  | — |  |  | 25 |  |  | 36.90 |
Cancellations | (61 | ) |  | 36.00 |  |  | (12 | ) |  | 30.52 |
Released | (286 | ) |  | 27.89 |  |  | (225 | ) |  | 43.11 |
Vested but not released | — |  |  | — |  |  | (174 | ) |  | 32.40 |
Unvested, December 31, 2017 | 451 |  |  | $ | 37.79 |  |  | 172 |  |  | $ | 33.61 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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