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Employee Benefits and Share-Based Compensation - Stock Options and ESPP Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
2009 Plan
Number of Shares
Outstanding at December 31, 2016 (in shares)	3,214
Granted (Awarded) (in shares)	1,045
Exercised (Released) (in shares)	(813)
Expired (in shares)	(6)
Forfeited (in shares)	(117)
Outstanding at December 31, 2017 (in shares)	3,323	3,214
Exercisable at December 31, 2017 (in shares)	1,350
Vested and expected to vest at December 31, 2017 and thereafter (in shares)	3,323
Weighted-Average Exercise Price
Outstanding at December 31, 2016 (in dollars per share)	$ 26.06
Granted (Awarded) (in dollars per share)	45.13
Exercised (Released) (in dollars per share)	22.28
Expired (in dollars per share)	27.54
Forfeited (in dollars per share)	33.39
Outstanding at December 31, 2017 (in dollars per share)	32.72	$ 26.06
Exercisable at December 31, 2017 (in dollars per share)	23.87
Vested and expected to vest at December 31, 2017 and thereafter (in dollars per share)	$ 32.72
Weighted-Average Remaining Years	7 years 7 months 13 days	7 years 3 months
Exercisable at December 31, 2017 (in years)	5 years 9 months 26 days
Vested and expected to vest at December 31, 2017 and thereafter (in years)	7 years 7 months 13 days
Outstanding at December 31, 2017, Aggregate Intrinsic Value	$ 53,953	$ 26,331
Exercisable at December 31, 2017, Aggregate Intrinsic Value	33,293
Vested and expected to vest at December 31, 2017 and thereafter, Aggregate Intrinsic Value	$ 53,953
2009 Plan | Employee Stock Option
Weighted-Average Exercise Price
Weighted-average fair value (in usd per share)	$ 13.25	$ 9.33	$ 9.67
Intrinsic value of options exercised	$ 18,200	$ 5,600	$ 11,300
Unrecognized compensation cost of unvested stock options	$ 18,900	$ 13,300
Weighted average period of compensation cost recognized (in years)	2 years 11 months 9 days	3 years
1997 Employee Stock Purchase Plan | Employee Stock
Weighted-Average Exercise Price
Weighted average period of compensation cost recognized (in years)	1 year 4 months 6 days
Shares purchased under ESPP	500
Shares issued under ESPP	6,000
Unrecognized compensation cost	$ 900

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