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	17,873	17,873
Stock-based compensation expense	0	0	0	0	0	425	0	425
Repurchase of shares of common stock	0	0	0	0	(1)	(904)	0	(905)
Issuance of shares of Class A common stock	0	4	0	0	0	33,278	0	33,282
Exercise of options for common stock	0	0	0	0	0	315	0	315
Adjustment of redeemable noncontrolling interests to estimated redemption value	0	0	0	0	0	(1,425)	0	(1,425)
BALANCE at Jun. 30, 2021	0	8	3	3	37	1,023,458	(787,046)	236,463
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	31,403	31,403
Stock-based compensation expense	0	0	0	0	0	460	0	460
Repurchase of shares of common stock	0	0	0	0	(4)	(24,665)		(24,669)
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	(1,803)	0	(1,803)
BALANCE at Jun. 30, 2022	$ 0	$ 9	$ 3	$ 2	$ 33	$ 994,678	$ (735,164)	$ 259,561