CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss, net	(Accumulated Deficit) Retained Earnings	Noncontrolling Interest in Subsidiary
Beginning balance (in shares) at Dec. 31, 2019		35,871
Beginning balance at Dec. 31, 2019	$ 163,500	$ 4	$ 305,643	$ (1,240)	$ (141,775)	$ 868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		306
Vesting of restricted stock	(657)		(657)
Equity compensation	4,063		4,063
Foreign currency translation adjustment, net of taxes	(54)			(54)
Distribution to noncontrolling shareholder	(968)					(968)
Consolidated net income (loss)	(16,964)				(17,574)	610
Ending balance (in shares) at Sep. 30, 2020		36,177
Ending balance at Sep. 30, 2020	148,920	$ 4	309,049	(1,294)	(159,349)	510
Beginning balance (in shares) at Jun. 30, 2020		36,175
Beginning balance at Jun. 30, 2020	149,074	$ 4	307,985	(1,327)	(158,015)	427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		2
Vesting of restricted stock	0		0
Equity compensation	1,064		1,064
Foreign currency translation adjustment, net of taxes	33			33
Distribution to noncontrolling shareholder	(103)					(103)
Consolidated net income (loss)	(1,148)				(1,334)	186
Ending balance (in shares) at Sep. 30, 2020		36,177
Ending balance at Sep. 30, 2020	148,920	$ 4	309,049	(1,294)	(159,349)	510
Beginning balance (in shares) at Dec. 31, 2020		36,177
Beginning balance at Dec. 31, 2020	154,909	$ 4	310,388	(1,280)	(154,737)	534
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		479
Vesting of restricted stock	(2,230)		(2,230)
Equity compensation	5,257		5,257
Foreign currency translation adjustment, net of taxes	(32)			(32)
Acquisition of WSG (in shares)		308
Acquisition of WSG	5,000		5,000
Dissolution of noncontrolling interest	(324)					(324)
Distribution to noncontrolling shareholder	(210)					(210)
Consolidated net income (loss)	54,429				54,429
Ending balance (in shares) at Sep. 30, 2021		36,964
Ending balance at Sep. 30, 2021	216,799	$ 4	318,415	(1,312)	(100,308)	0
Beginning balance (in shares) at Jun. 30, 2021		36,962
Beginning balance at Jun. 30, 2021	192,131	$ 4	316,644	(1,310)	(123,741)	534
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		2
Vesting of restricted stock	0		0
Equity compensation	1,771		1,771
Foreign currency translation adjustment, net of taxes	(2)			(2)
Dissolution of noncontrolling interest	(324)					(324)
Distribution to noncontrolling shareholder	(210)					(210)
Consolidated net income (loss)	23,433				23,433
Ending balance (in shares) at Sep. 30, 2021		36,964
Ending balance at Sep. 30, 2021	$ 216,799	$ 4	$ 318,415	$ (1,312)	$ (100,308)	$ 0