Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 16,760	$ 16,941
Accumulated depreciation and amortization of property and equipment	231,333	233,786
Accumulated amortization of intangible assets	$ 118,905	$ 110,909
Preferred stock, par value ( in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares outstanding (in shares)	35,072,000	34,897,000
Common stock, shares issued (in shares)	35,072,000	34,897,000