CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock Convertible Preferred Stock	Common Stock Common Stock Class A	Common Stock Common Stock Class B	Common Stock Common Stock Class C	Common Stock Common Stock Class D	Additional Paid-In Capital	Accumulated Deficit	Total
BALANCE at Dec. 31, 2020	$ 0	$ 4	$ 3	$ 3	$ 38	$ 991,769	$ (804,919)	$ 186,898
Consolidated net income	0	0	0	0	0	0	31,749	31,749
Stock-based compensation expense	0	0	0	0	0	478	0	478
Repurchase of shares of common stock	0	0	0	0	(1)	(943)	0	(944)
Issuance of shares of Class A common stock	0	4	0	0	0	33,273	0	33,277
Exercise of options for common stock	0	0	0	0	0	366	0	366
Adjustment of redeemable noncontrolling interests to estimated redemption value	0	0	0	0	0	(3,671)	0	(3,671)
BALANCE at Sep. 30, 2021	0	8	3	3	37	1,021,272	(773,170)	248,153
BALANCE at Dec. 31, 2021	0	9	3	2	37	1,020,636	(766,567)	254,120
Consolidated net income	0	0	0	0	0	0	35,616	35,616
Stock-based compensation expense	0	1	0	0	1	5,467	0	5,469
Repurchase of shares of common stock	0	0	0	0	(4)	(26,482)		(26,486)
Exercise of options for common stock	0	0	0	0	0	50	0	50
Adjustment of redeemable noncontrolling interests to estimated redemption value	0	0	0	0	0	(2,717)	0	(2,717)
BALANCE at Sep. 30, 2022	$ 0	$ 10	$ 3	$ 2	$ 34	$ 996,954	$ (730,951)	$ 266,052