CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Allowance for doubtful accounts	$ 8,717	$ 8,789
Stockholders’ equity
Preferred stock, par value in USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (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 issued (in shares)	33,271,659	33,141,879
Common stock, shares outstanding (in shares)	29,706,401	29,623,272
Treasury Stock (in shares)	3,565,258	3,518,607