Stockholders' Equity - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 31, 2021	Nov. 30, 2018
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 1,100,000
Stock repurchase program, remaining authorized repurchase amount	$ 320,600		$ 320,600
Repurchases of common stock			251,257	$ 121,078
Amortization expense from capitalized stock-based compensation	$ 7,900	$ 7,100	$ 24,500	$ 21,900
Subsequent Event
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,800,000
Common Stock
Class of Stock [Line Items]
Shares repurchased during period (in shares)	0.8		2.3
Repurchases of common stock	$ 96,800		$ 251,300