Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 20,903	$ 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)	88,890,679	85,700,953
Common stock, shares outstanding (in shares)	88,549,394	85,308,386
Treasury stock, at cost (shares)	341,285	392,567