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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity for the year ended December 31, 2015:

	Shares (in thousands)			Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2014	6,812			$	23.26
Granted	1,519			41.00
Exercised	(1,520	)		18.14
Forfeited or expired	(167	)		31.94
Outstanding as of December 31, 2015	6,644			$	28.27			7.11		$	57,955
Exercisable as of December 31, 2015	2,596			$	17.69			5.31		$	43,597
Options vested or expected to vest at   December 31, 2015 (1)	6,065			$	27.29			6.96		$	57,291

(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,
	2015			2014			2013
Risk-free rate	2.1	%		2.6	%		2.0	%
Expected dividend yield	1.25	%		—	%		—	%
Expected volatility	40	%		41	%		42	%
Expected term (in years)	5.4			5.4			5.8

Nonvested Restricted Stock Shares Activity [Table Text Block]

The following table summarizes the Company's restricted stock activity for the year ended December 31, 2015:

	Shares (in thousands)			Weighted-Average Grant Fair Value				Aggregate Intrinsic Value (in thousands) (1)
Nonvested as of December 31, 2014	20			$	34.05
Granted	—			—
Vested	—			—
Forfeited or expired	—			—
Nonvested as of December 31, 2015	20			$	34.05			$	675

    (1) Fair market value as of December 31, 2015.

Stock-Based Compensation Expense

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

	Year Ended December 31,
	2015				2014				2013
Cost of revenue	$	1,515			$	1,116			$	820
Research, development, and engineering	5,194				3,709				2,502
Selling, general, and administrative	13,032				9,234				6,461
Discontinued operations	1,533				1,099				837
	$	21,274			$	15,158			$	10,620

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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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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-SubTopic 10
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-Paragraph 2
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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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