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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

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,
		2018				2017				2018				2017
Cost of revenues		$	170			$	1,016			$	2,664			$	3,133
Research and development expense			708				712				2,249				2,284
Selling, general and administrative expense			4,335				3,117				17,092				14,417
Total pre-tax stock-based compensation expense		$	5,213			$	4,845			$	22,005			$	19,834

Summary of Activity for RSUs

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

		Nine Months Ended September 30, 2018
		Outstanding RSUs				Weighted Average Grant Date Fair Value
RSUs – beginning of period			943,379			$	47.57
Accrued dividend shares			46			$	105.26
Granted			260,341			$	112.49
Vested			(487,856	)		$	44.60
Forfeited			(62,021	)		$	65.37
RSUs – end of period			653,889			$	73.95

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, 2018
		Outstanding SARs				Weighted Average Grant Date Fair Value
SARs – beginning of period			282,907			$	28.62
Exercised			(100,683	)		$	28.77
Forfeited or expired			(1,950	)		$	29.00
SARs Outstanding – end of period			180,274			$	28.52

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- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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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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