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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary Of Employee Stock-Based Compensation Expense | Stock-based compensation expense - all related to employees - recognized under the authoritative guidance was as follows:
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| (In thousands)
Selling, general and administrative | $ | 14,461 |  |  | $ | 13,940 |  |  | $ | 9,484 |
Research and development | 714 |  |  | 463 |  |  | 277 |
Cost of goods sold | 275 |  |  | 151 |  |  | 81 |
Total stock-based compensation expense | 15,450 |  |  | 14,554 |  |  | 9,842 |
Total estimated tax benefit related to stock-based compensation expense | 5,792 |  |  | 5,350 |  |  | 3,806 |
Net effect on net income | $ | 9,658 |  |  | $ | 9,204 |  |  | $ | 6,036 |
Summary Of Weighted-Average Assumptions | The following weighted-average assumptions were used in the calculation of fair value:
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Dividend yield | 0% |  | 0% |  | 0%
Expected volatility | 29% |  | 29% |  | 31%
Risk free interest rate | 1.96% |  | 2.41% |  | 1.52%
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 December 31, 2014 | 1,238 |  |  | $ | 39.89 |  |  |  |  |
Modification upon spin-off (1) | 58 |  |  | — |  |  |  |  |
Granted | 98 |  |  | 62.37 |  |  |  |  |
Exercised | (200 | ) |  | 35.57 |  |  |  |  |
Forfeited or Expired | (1 | ) |  | 53.73 |  |  |  |  |
Outstanding at December 31, 2015 | 1,193 |  |  | $ | 37.09 |  |  | 3.26 |  | $ | 36,614 |
Vested or expected to vest at December 31, 2015 | 1,193 |  |  | $ | 37.09 |  |  | 3.26 |  | $ | 36,614 |
Exercisable at December 31, 2015 | 1,037 |  |  | $ | 35.02 |  |  | 2.69 |  | $ | 33,980 |
Summary Of Vested And Unvested RSU | The following table summarizes the Company’s awards of restricted stock, performance stock and contract stock for the year ended December 31, 2015.
|  |  |  |  | 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, December 31, 2014 | 308 |  |  | $ | 37.29 |  |  | 283 |  |  | $ | 32.74 |
Modification upon spin-off | 42 |  |  | — |  |  | 2 |  |  | — |
Surrendered upon spin-off | (3 | ) |  | — |  |  | — |  |  | — |
Granted | 169 |  |  | 62.32 |  |  | 3 |  |  | 59.52 |
Cancellations | (56 | ) |  | 47.79 |  |  | (1 | ) |  | 45.46 |
Released | (166 | ) |  | 42.48 |  |  | (121 | ) |  | 36.51 |
Unvested, December 31, 2015 | 294 |  |  | $ | 48.20 |  |  | 166 |  |  | $ | 33.30 |

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