Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 76,751	$ 45,726
Accumulated amortization of other intangible assets	22,424	19,300
Allowance for doubtful accounts, noncurrent	$ 5,342	$ 6,667
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	100,000,000	100,000,000
Common stock issued (in shares)	75,734,000	75,557,000
Common stock outstanding (in shares)	74,423,000	74,149,000
Common stock in treasury (in shares)	1,311,000	1,408,000