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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity for the year ended December 31, 2013:

		Shares (in thousands)				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (in  years)				Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2012			7,118			$	12.78
Granted			1,740				21.47
Exercised			(2,445	)			11.37
Forfeited or expired			(275	)			16.39
Outstanding as of December 31, 2013			6,138			$	15.65				7.2			$	138,302
Exercisable as of December 31, 2013			1,678			$	11.72				5.3			$	44,386
Options vested or expected to vest at December 31, 2013 (1)			5,541			$	15.32				7.1			$	126,670

(1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.

Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted

The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:

		Year Ended December 31,
		2013				2012				2011
Risk-free rate			2.0	%			2.0	%			2.9	%
Expected dividend yield			-	%			1.2	%			1.1	%
Expected volatility			42	%			44	%			43	%
Expected term (in years)			5.8				5.7				5.5

Stock-Based Compensation Expense

The following table details the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):

		Year Ended December 31,
		2013				2012				2011
Product cost of revenue		$	747			$	581			$	456
Service cost of revenue			177				161				172
Research, development, and engineering			2,585				2,149				2,268
Selling, general, and administrative			7,111				5,629				5,172
		$	10,620			$	8,520			$	8,068

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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 number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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