CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated (Deficit)
Balance (in shares) at Dec. 31, 2017		112,703,926		3,356,409
Balance, beginning of period at Dec. 31, 2017	$ 73,797	$ 113	$ 164,649	$ (44,384)	$ (46,581)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	13,311		13,311
Exercise of stock options (in shares)				(786,708)
Tax benefit of share-based compensation	3,554		(8,211)	$ 11,765
Issuance of restricted stock (in shares)				(1,821,475)
Issuance of restricted stock	0		(24,107)	$ 24,107
Restricted stock shares canceled/forfeited	0		12,371	$ (12,371)
Restricted stock shares cancelled/forfeited (in shares)				1,034,301
Share repurchase (in shares)				507,600
Share repurchase	(7,572)			$ (7,572)
Shares repurchased for tax withholding (in shares)				557,248
Shares repurchased for tax withholding	(4,629)			$ (4,629)
Net (loss) income	6,245
Balance (in shares) at Sep. 30, 2018		112,703,926		2,847,375
Balance, end of period at Sep. 30, 2018	84,706	$ 113	158,013	$ (33,084)	(40,336)
Balance (in shares) at Jun. 30, 2018		112,703,926		1,970,255
Balance, beginning of period at Jun. 30, 2018	81,151	$ 113	151,290	$ (30,094)	(40,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	3,958		3,958
Restricted stock shares canceled/forfeited	0		2,765	$ (2,765)
Restricted stock shares cancelled/forfeited (in shares)				826,932
Shares repurchased for tax withholding (in shares)				50,188
Shares repurchased for tax withholding	(225)			$ (225)
Net (loss) income	(178)				(178)
Balance (in shares) at Sep. 30, 2018		112,703,926		2,847,375
Balance, end of period at Sep. 30, 2018	84,706	$ 113	158,013	$ (33,084)	(40,336)
Balance (in shares) at Dec. 31, 2018		112,703,926		3,605,263
Balance, beginning of period at Dec. 31, 2018	49,655	$ 113	164,744	$ (38,642)	(76,560)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	9,199		9,199
Exercise of stock options (in shares)				150,000
Tax benefit of share-based compensation	108		(1,344)	$ 1,452
Issuance of restricted stock (in shares)				2,853,235
Issuance of restricted stock	0		(35,740)	$ 35,740
Restricted stock shares canceled/forfeited	0		6,788	$ (6,788)
Restricted stock shares cancelled/forfeited (in shares)				722,227
Shares repurchased for tax withholding (in shares)				394,140
Shares repurchased for tax withholding	(1,283)			$ (1,283)
Net (loss) income	(18,104)				(18,104)
Balance (in shares) at Sep. 30, 2019		112,703,926		1,718,395
Balance, end of period at Sep. 30, 2019	39,575	$ 113	143,647	$ (9,521)	(94,664)
Balance (in shares) at Jun. 30, 2019		112,703,926		1,155,034
Balance, beginning of period at Jun. 30, 2019	24,684	$ 113	136,298	$ (4,684)	(107,043)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	2,685		2,685
Restricted stock shares canceled/forfeited			4,664	$ (4,664)
Restricted stock shares cancelled/forfeited (in shares)				530,274
Shares repurchased for tax withholding (in shares)				33,087
Shares repurchased for tax withholding	(173)			$ (173)
Net (loss) income	12,379				12,379
Balance (in shares) at Sep. 30, 2019		112,703,926		1,718,395
Balance, end of period at Sep. 30, 2019	$ 39,575	$ 113	$ 143,647	$ (9,521)	$ (94,664)