CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Treasury Stock	Noncontrolling Interest
Balance at Dec. 31, 2018	$ 159,052	$ 1,011	$ 1,256,267	$ (3)	$ (1,103,692)	$ 0	$ 5,469
Balance (in shares) at Dec. 31, 2018		101,098,000				0
Increase (Decrease) in Stockholders' Equity
Distributions to noncontrolling interest	(10,553)	$ 0	0	0	0	$ 0	(10,553)
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding	538	$ 2	536	0	0	0	0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares)		190,000
Stock-based compensation	2,056	$ 0	2,056	0	0	0	0
Net income	190,993	0	0	0	157,288	0	33,705
Other comprehensive income	30	0	0	30	0	0	0
Balance at Dec. 31, 2019	342,116	$ 1,013	1,258,859	27	(946,404)	$ 0	28,621
Balance (in shares) at Dec. 31, 2019		101,288,000				0
Increase (Decrease) in Stockholders' Equity
Distributions to noncontrolling interest	(30,474)	$ 0	0	0	0	$ 0	(30,474)
Equity activity of noncontrolling interest from a consolidated variable interest entity	366	0	0	0	0	0	366
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding	344	$ 1	343	0	0	$ 0	0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares)		104,000				0
Stock-based compensation	1,698	$ 0	1,698	0	0	$ 0	0
Net income	293,814	0	0	0	224,402	0	69,412
Other comprehensive income	(27)	0	0	(27)	0	0	0
Balance at Dec. 31, 2020	$ 607,837	$ 1,014	1,260,900	0	(722,002)	$ 0	67,925
Balance (in shares) at Dec. 31, 2020	101,392,000	101,392,000				0
Increase (Decrease) in Stockholders' Equity
Distributions to noncontrolling interest	$ (59,457)	$ 0	0	0	0	$ 0	(59,457)
Equity activity of noncontrolling interest from a consolidated variable interest entity	259	0	0	0	0	0	259
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding	1,109	$ 2	1,107	0	0	$ 0	0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares)		179,000				0
Repurchase of common stock	394,149	$ (320)	0	0	0	$ (393,829)	0
Repurchase of common stock (in shares)		(32,005,000)				32,005,000
Stock-based compensation	2,017	$ 0		0	0	$ 0	0
Net income	368,837	0	0	0	265,854	0	102,983
Balance at Dec. 31, 2021	$ 525,935	$ 696	$ 1,264,024	$ 0	$ (456,148)	$ (393,829)	$ 111,192
Balance (in shares) at Dec. 31, 2021	69,566,000	69,566,000				32,005,000