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Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2017		Three Months Ended March 31, 2016
Cost of revenues	$	930	$	440
Research and development expense		745		374
Selling, general and administrative expense		7,107		3,338

Total pre-tax stock-based compensation expense	$	8,782	$	4,152

Summary of Activity for RSUs

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


	Three Months Ended March 31, 2017
	Outstanding RSUs			Weighted Average Grant Date Fair Value
RSUs – beginning of period		1,325,516		$	34.38
Accrued dividend shares		47			66.20
Granted		171,179			66.06
Vested		(499,743	)		33.59
Forfeited or expired		(34,180	)		33.50

RSUs – end of period		962,819		$	40.46

Summary of Activity for Outstanding and Exercisable SARs

At March 31, 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		469,565	$	28.74		3.9	$	18,787
SARs exercisable		398,868	$	28.32		3.7	$	16,127

Stock Appreciation Rights (SARs) [Member]

Summary of Activity for Outstanding and Exercisable SARs

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


	Three Months Ended March 31, 2017
	Outstanding SARs			Weighted Average Grant Date Fair Value
SARs – beginning of period		599,334		$	28.10
Granted		—			—
Exercised		(120,206	)		25.81
Forfeited or expired		(9,563	)		25.58

SARs Outstanding – end of period		469,565		$	28.74