Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 118,911	$ 98,719
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	475,000,000	475,000,000
Common stock, shares issued (in shares)	127,349,188	127,113,023
Common stock, shares outstanding (in shares)	77,339,047	78,879,551
Treasury stock, shares (in shares)	50,010,141	48,233,471