Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Cost of revenues	$	1,187	$	890	$	2,117	$	1,330
Research and development expense		827		689		1,572		1,063
Selling, general and administrative expense		4,193		8,937		11,300		12,275

Total pre-tax stock-based compensation expense	$	6,207	$	10,516	$	14,989	$	14,668

Summary of Activity for RSUs

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


	Six Months Ended June 30, 2017
	Outstanding RSUs			Weighted Average Grant Date Fair Value
RSUs – beginning of period		1,325,516		$	34.38
Accrued dividend shares		73			71.76
Granted		376,081			67.13
Vested		(675,662	)		34.48
Forfeited or expired		(60,149	)		36.02

RSUs – end of period		965,859		$	46.96

Summary of Activity for Outstanding and Exercisable SARs

At June 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		361,799	$	28.52		3.6	$	14,031
SARs exercisable		296,141	$	27.94		3.3	$	11,657

Stock Appreciation Rights (SARs) [Member]

Summary of Activity for Outstanding and Exercisable SARs

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


	Six Months Ended June 30, 2017
	Outstanding SARs			Weighted Average Grant Date Fair Value
SARs – beginning of period		599,334		$	28.10
Granted		—			—
Exercised		(223,297	)		27.48
Forfeited or expired		(14,238	)		27.37

SARs Outstanding – end of period		361,799		$	28.52