Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 4,178	$ 4,003
Preferred stock par value	$ 1	$ 1
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock shares issued	0	0
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	100,000,000	100,000,000
Common stock shares issued	35,071,410	34,707,860
Common stock shares outstanding	28,363,266	29,215,702
Treasury stock shares	6,708,144	5,492,158