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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

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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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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-Name Accounting Standards Codification
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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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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.

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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.

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