Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 14,793	$ 13,026
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	86,269,033	85,700,953
Common stock, shares outstanding (in shares)	85,927,060	85,308,386
Treasury stock, at cost (shares)	341,973	392,567