Net Income per Share - Schedule of Components (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 651,642	$ 557,054	$ 478,035
Denominator:
Shares used for basic net income per share (in shares)	162,665	162,490	162,706
Effect of dilutive securities:
Stock options (in shares)	21	31	68
RSUs and deferred stock units (in shares)	1,518	1,819	1,799
Convertible senior notes (in shares)	1,600	873	0
Warrants related to issuance of convertible senior notes (in shares)	0	0	0
Shares used for diluted net income per share (in shares)	165,804	165,213	164,573
Basic net income per share (in dollars per share)	$ 4.01	$ 3.43	$ 2.94
Diluted net income per share (in dollars per share)	$ 3.93	$ 3.37	$ 2.90