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Stockholders' equity (Tables)

9 Months Ended

Sep. 30, 2015

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

Schedule of Share-based Compensation, Stock Options, Activity

A summary of the Company’s stock option activity and related information is as follows:

		Options outstanding
(shares in thousands)		Shares			Weighted- average exercise price				Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2014:		25,134			$	6.62			$	1,425,339
Granted		527			47.37
Exercised		(12,027	)		1.97
Forfeited/Cancelled		(249	)		18.65
Outstanding at September 30, 2015:		13,385			$	12.19			$	276,067
Exercisable at September 30, 2015		8,258			$	5.48			$	214,083
Vested and expected to vest at September 30, 2015		13,127			$	11.94			$	273,232

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of the Company’s RSU activity is as follows:

(shares in thousands)	Shares			Weighted- average grant date fair value
Non-vested shares at December 31, 2014	4,307			$	21.98
Granted	1,525			52.93
Vested	(1,372	)		16.53
Forfeited	(52	)		69.51
Non-vested shares at September 30, 2015	4,408			$	33.82

Allocation of Stock-based Compensation Expense

Total stock-based compensation expense recognized was as follows:

	Three months ended								Nine months ended
(in thousands)	September 30, 2015				September 30, 2014				September 30, 2015				September 30, 2014
Stock-based compensation expense:
Cost of revenue	$	410			$	233			$	1,043			$	555
Research and development	4,872				2,428				12,117				5,486
Sales and marketing	3,516				3,225				9,514				6,293
General and administrative	9,072				8,027				39,886				39,809
Total stock-based compensation expense	17,870				13,913				62,560				52,143
Total tax benefit recognized	(7,323		)		(2,949		)		(22,867		)		(14,774		)
Decrease in net income	$	10,547			$	10,964			$	39,693			$	37,369

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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 grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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