Net Income Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 37,080	$ 38,801	$ 391,303	$ 39,926	$ 75,881	$ 431,229
Net income (loss) available to common stockholders, basic	37,080		391,303		75,881	431,229
Net income (loss) available to common stockholders, diluted	$ 38,192		$ 391,303		$ 78,103	$ 431,229
Denominator:
Weighted average number of common shares outstanding used in computing net income per share - basic (in shares)	153,304		161,948		155,550	161,460
Effect of dilutive securities:
Weighted average number of common shares outstanding used in computing net income per share - diluted (in shares)	184,876		163,495		187,315	163,134
Net income per share - basic (in dollars per share)	$ 0.24		$ 2.42		$ 0.49	$ 2.67
Net income per share - diluted (in dollars per share)	$ 0.21		$ 2.39		$ 0.42	$ 2.64
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	361		417		339	348
Time-based Restricted Stock Units
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	922		928		1,211	1,121
Performance-based Restricted Stock Units
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	270		70		188	71
Restricted Stock
Effect of dilutive securities:
Effect of dilutive securities, share-based compensation	151		132		159	134
0.75% Convertible Senior Notes due 2024
Numerator:
Add back interest expense, net of tax benefit, on assumed conversion of convertible notes	$ 445				$ 889
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				$ 1,333
Effect of dilutive securities:
Effect of dilutive securities, convertible notes	14,934				14,934