Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 110,648	$ 101,380
Intangible assets, amortization	$ 6,761	$ 4,178
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	87,908,259	87,264,910
Common stock, shares outstanding	70,105,521	70,062,364
Treasury stock, shares	17,802,738	17,202,546