Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017		2016		2017		2016
Cost of revenues	$	1,016	$	666	$	3,133	$	1,996
Research and development expense		712		551		2,284		1,614
Selling, general and administrative expense		3,117		3,941		14,417		16,216

Total pre-tax stock-based compensation expense	$	4,845	$	5,158	$	19,834	$	19,826

Summary of Activity for RSUs

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


	Nine Months Ended September 30, 2017
	Outstanding RSUs			Weighted Average Grant Date Fair Value
RSUs – beginning of period		1,325,516		$	34.38
Accrued dividend shares		99			74.58
Granted		388,137			67.58
Vested		(681,365	)		34.53
Forfeited		(71,783	)		37.45

RSUs – end of period		960,604		$	47.46

Summary of Activity for Outstanding and Exercisable SARs

At September 30, 2017 the Company’s outstanding and exercisable SARs, the weighted-average base value, the weighted average remaining contractual life and the aggregate intrinsic value thereof, were as follows:


	Number of Shares		Weighted Average Base Value		Weighted Average Remaining Contractual Life (years)		Aggregate Intrinsic Value
SARs outstanding		323,698	$	28.58		3.4	$	21,323
SARs exercisable		260,049	$	27.95		3.1	$	17,292

Stock Appreciation Rights (SARs) [Member]

Summary of Activity for Outstanding and Exercisable SARs

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


	Nine Months Ended September 30, 2017
	Outstanding SARs			Weighted Average Grant Date Fair Value
SARs – beginning of period		599,334		$	28.10
Granted		—			—
Exercised		(258,854	)		27.52
Forfeited or expired		(16,782	)		27.88

SARs Outstanding – end of period		323,698		$	28.58