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Stock-Based Compensation Schedule of Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 1,000
Stock options outstanding, shares	1,835,260	2,623,217
Stock options exercised, shares	(772,157)
Stock options forfeited/canceled, shares	(15,800)
Exercisable stock options, shares	1,835,260
Exercisable and expected to vest stock options, shares	1,835,260
Stock options outstanding, weighted average exercise price	$ 9.31	$ 9.19
Stock options exercised, weighted average exercise price	$ 8.61
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 18,256
Stock options forfeited/canceled, weighted average exercise price	$ 24.12
Exercisable stock options, weighted average exercise price	9.31
Exercisable and expected to vest stock options, weighted average exercise price	$ 9.31
Stock options outstanding, weighted average remaining contractual term (years)	1 year 9 months 10 days
Exercisable stock options, weighted average remaining contractual term (years)	1 year 9 months 10 days
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, weighted average remaining contractual term	1 year 9 months 10 days
Stock options outstanding, aggregate intrinsic value	$ 48,969
Exercisable stock options, aggregate intrinsic value	48,969
Exercisable and expected to vest stock options, aggregate intrinsic value	$ 48,969

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

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Number of options outstanding, including both vested and non-vested options.

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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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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options forfeited.

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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