Unaudited Condensed Consolidated Statements of Changes in Stockholders' (Deficit) Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock, at Cost [Member]
Beginning Balance at Dec. 31, 2019	$ 210,892	$ 940	$ 673,893	$ (59,479)	$ (1,559)	$ (402,903)
Beginning Balance, shares at Dec. 31, 2019		94,044,203
Equity-based compensation	(3,601)		(3,601)
Unrealized gain on derivatives, net of tax	704				704
Vesting of restricted shares		$ 4	(4)
Vesting of restricted shares, shares		410,807
Shares withheld for tax withholdings	(3,160)	$ (1)	(3,159)
Shares withheld for tax withholdings, shares		(121,089)
Exercise of stock options	203		203
Exercise of stock options, shares		11,096
Adjustments to previous dividend declarations	1		1
Repurchase of treasury shares	(12,406)					(12,406)
Net loss	(56,519)			(56,519)
Ending Balance at Mar. 31, 2020	136,114	$ 943	667,333	(115,998)	$ (855)	(415,309)
Ending Balance, shares at Mar. 31, 2020		94,345,017
Beginning Balance at Dec. 31, 2020	$ (105,803)	$ 946	680,360	(371,800)		(415,309)
Beginning Balance, shares at Dec. 31, 2020	94,652,248	94,652,248
Equity-based compensation	$ 4,473		4,473
Vesting of restricted shares		$ 1	(1)
Vesting of restricted shares, shares		130,834
Shares withheld for tax withholdings	(1,971)		(1,971)
Shares withheld for tax withholdings, shares		(41,271)
Exercise of stock options	2,393	$ 1	2,392
Exercise of stock options, shares		116,634
Net loss	(44,884)			(44,884)
Ending Balance at Mar. 31, 2021	$ (145,792)	$ 948	$ 685,253	$ (416,684)		$ (415,309)
Ending Balance, shares at Mar. 31, 2021	94,858,445	94,858,445