Net Income per Share - Schedule of Components Used in Diluted and Basic Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (in dollars)	$ 155,695	$ 123,146
Denominator:
Shares used for basic net income per share	163,061	161,992
Effect of dilutive securities:
Stock options	5	11
RSUs and DSUs	1,667	1,681
Convertible senior notes	955	0
Warrants related to issuance of convertible senior notes	0	0
Shares used for diluted net income per share	165,688	163,684
Basic net income per share (in dollars per share)	$ 0.95	$ 0.76
Diluted net income per share (in dollars per share)	$ 0.94	$ 0.75