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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income

The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows:

		Three Months Ended September 30,								Nine Months Ended September 30,
		2019				2018				2019				2018
Cost of revenues		$	818			$	170			$	1,876			$	2,664
Research and development expense			971				708				2,842				2,249
Selling, general and administrative expense			4,009				4,335				16,253				17,092
Acquisition and integration related expense			1,202				—				20,796				—
Restructuring related expense			373				—				373				—
Total pre-tax stock-based compensation expense		$	7,373			$	5,213			$	42,140			$	22,005

Summary of Activity for RSUs

The following table presents the activity for RSUs under the Plan:

		Nine Months Ended September 30, 2019
		Outstanding RSUs				Weighted Average Grant Date Fair Value
RSUs – beginning of period			647,394			$	74.04
Assumed shares from ESI Merger			736,133			$	84.10
Accrued dividend shares			4,307			$	79.20
Granted			417,335			$	86.18
Vested			(533,007	)		$	69.11
Forfeited			(134,833	)		$	89.58
RSUs – end of period			1,137,329			$	85.50

Stock Appreciation Rights (SARs) [Member]

Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights

The following table presents the activity for SARs under the Plan:

		Nine Months Ended September 30, 2019
		Outstanding SARs				Weighted Average Grant Date Fair Value
SARs – beginning of period			177,538			$	28.52
Assumed SARs from ESI Merger			12,787			$	17.38
Exercised			(46,414	)		$	27.07
Forfeited or expired			(3,998	)		$	23.00
SARs outstanding – end of period			139,913			$	28.18

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year.

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