CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Parent [Member]	Member's Deficiency	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interests	Treasury Stock, Common	Common Class A Common Stock	Common Class B Common Stock
Beginning balance at Dec. 31, 2021	$ (870,902)	$ (819,788)	$ 18,005	$ (848,836)	$ 6,497	$ (51,114)	$ 0	$ 2,703	$ 1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent, Total	196,551	196,551		196,551
Net Income (Loss) Attributable to Noncontrolling Interest	(5,590)					(5,590)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(1,843)	(1,843)			1,843
Foreign currency translation adjustment	(170)	(170)			(170)
Share-based compensation expense (equity classified)	40,512	40,512	40,512
Stock Issued During Period, Value, New Issues	10	10	10
Ending balance at Mar. 31, 2022	(626,566)	(581,042)	58,527	(652,285)	8,170	(45,524)	0	2,703	1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated deficit	(654,273)
Beginning balance at Dec. 31, 2022	(503,912)	(475,211)	182,701	(654,273)	(8,201)	(28,701)	0	2,719	1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent, Total	25,865	25,865		25,865
Net Income (Loss) Attributable to Noncontrolling Interest	(5,305)					(5,305)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(1,061)	(1,061)			1,061
Foreign currency translation adjustment	(190)	(188)			(188)	(2)
Share-based compensation expense (equity classified)	(8,718)	(8,718)	(8,718)
Ending balance at Mar. 31, 2023	(502,864)	(471,439)	159,750	$ (628,408)	$ (7,328)	(31,425)	$ 0	2,704	$ 1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Change in Redemption Value	(22,193)	(14,166)	(14,166)			$ (8,027)
Other adjustment to equity (deficiency)	(82)	$ (82)	$ (67)					$ (15)
Accumulated deficit	$ (628,408)