Net Income Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 50,317	$ 37,080	$ 38,801	$ 55,845	$ 391,303	$ 39,926	$ 126,198	$ 487,074
Net income (loss) available to common stockholders, basic	50,317			55,845			126,198	487,074
Net income (loss) available to common stockholders, diluted	$ 51,429			$ 55,845			$ 129,533	$ 487,074
Denominator:
Weighted average number of common shares outstanding used in computing net income per share - basic (in shares)	153,066			162,742			154,713	161,892
Effect of dilutive securities:
Weighted average number of common shares outstanding used in computing net income per share - diluted (in shares)	184,465			165,242			186,504	163,930
Net income per share - basic (in dollars per share)	$ 0.33			$ 0.34			$ 0.82	$ 3.01
Net income per share - diluted (in dollars per share)	$ 0.28			$ 0.34			$ 0.69	$ 2.97
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	283			802			318	461
Time-based Restricted Stock Units
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	966			1,392			1,278	1,342
Performance-based Restricted Stock Units
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	225			219			196	120
Restricted Stock
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	49			82			122	113
0.75% Convertible Senior Notes due 2024
Numerator:
Add back interest expense, net of tax benefit, on assumed conversion of convertible notes	$ 445						$ 1,335
Effect of dilutive securities:
Effect of dilutive securities, convertible notes	14,934						14,934
1.50% Convertible Senior Notes due 2026
Numerator:
Add back interest expense, net of tax benefit, on assumed conversion of convertible notes	$ 667						$ 2,000
Effect of dilutive securities:
Effect of dilutive securities, convertible notes	14,934						14,934