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Equity Incentive Plans Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options outstanding, shares		3,765,952	5,207,772	6,832,331	9,355,070
Stock options exercised, shares		(1,425,075)	(1,687,700)	(2,399,419)
Stock options forfeited/canceled, shares		(16,745)	(63,614)	(123,320)
Stock options granted, shares			126,755
Exercisable stock options, shares		3,673,816
Exercisable and expected to vest stock options, shares		3,756,738
Stock options outstanding, weighted average exercise price		$ 8.63	$ 8.04	$ 7.04	$ 6.90
Stock options exercised, weighted average exercise price		6.22	5.52	6.41
Stock options forfeited/canceled, weighted average exercise price		28.12	16.10	$ 8.89
Stock options granted, weighted average exercise price			$ 32.31
Exercisable stock options, weighted average exercise price		8.04
Exercisable and expected to vest stock options, weighted average exercise price		$ 8.58
Stock options outstanding, weighted average remaining contractual term (years)	2 years 11 months
Exercisable stock options, weighted average remaining contractual term (years)	2 years 11 months
Exercisable and expected to vest stock options, weighted average remaining contractual term (years)	2 years 11 months
Stock options outstanding, aggregate intrinsic value		$ 79,317
Exercisable stock options, aggregate intrinsic value		79,317
Exercisable and expected to vest stock options, aggregate intrinsic value		79,317
Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options exercised, aggregate intrinsic value		$ 32,375	$ 38,373	$ 46,899

X

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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