Stock-Based Compensation (Details 2) - Jun. 30, 2015 - Stock options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total
Summary of activities and changes in stock option plans
Number of shares outstanding at beginning of period	2,330
Weighted-average exercise price outstanding at beginning of period	$ 18.93
Number of shares granted	106
Weighted-average exercise price granted	$ 50.71
Number of shares exercised	(356)
Weighted-average exercise price exercised	$ 14.61
Number of shares forfeited	(64)
Weighted-average exercise price forfeited	$ 12.93
Number of shares expired	(1)
Weighted-average exercise price expired	$ 0.31
Number of shares outstanding at end of period	2,015
Weighted-average exercise price outstanding at end of period	$ 21.56
Weighted average remaining contractual term outstanding at end of period	6 years 3 months 3 days
Aggregate intrinsic value outstanding at end of period	$ 67,629
Number of shares exercisable at end of period	1,415
Weighted-average exercise price exercisable at end of period	$ 13.79
Weighted average remaining contractual term exercisable at end of period	5 years 4 months 3 days
Aggregate intrinsic value exercisable at end of period	$ 57,663
Number of shares vested and expected to vest at end of period	1,966
Weighted-average exercise price vested and expected to vest at end of period	$ 20.85
Weighted average remaining contractual term vested and expected to vest at end of period	6 years 2 months 8 days
Aggregate intrinsic value vested and expected to vest at end of period	$ 67,226