Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts receivable, trade, allowance for doubtful accounts	$ 8,029	$ 8,030
Property and equipment, accumulated depreciation	$ 299,737	$ 286,133
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	45,000,000	45,000,000
Preferred stock, shares issued (in shares)	0	0
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	360,000,000	360,000,000
Common stock, shares issued (in shares)	66,027,000	65,485,000
Common stock, shares outstanding (in shares)	31,434,000	30,892,000
Treasury stock, shares (in shares)	34,593,000	34,593,000
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, shares issued (in shares)	11,484,000	11,484,000
Common stock, shares outstanding (in shares)	11,484,000	11,484,000