Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 57,784	$ 59,271
Accumulated amortization of other intangible assets	29,097	27,879
Allowance for doubtful accounts, noncurrent	$ 5,308	$ 6,312
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)	76,158,000	76,009,000
Common stock outstanding (in shares)	74,036,000	73,769,000
Common stock in treasury (in shares)	2,122,000	2,240,000