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, 2017	$ 287,466	$ 926	$ 641,324	$ (194,837)	$ (5,076)	$ (154,871)
Beginning Balance, shares at Dec. 31, 2017		92,637,403
Impact of adoption of ASU 2018-02				1,094	(1,094)
Equity-based compensation	22,152		22,152
Unrealized gain (loss) on derivatives, net of tax	8,454				8,454
Vesting of restricted shares		$ 7	(7)
Vesting of restricted shares, shares		725,646
Shares withheld for tax withholdings	(3,977)	$ (1)	(3,976)
Shares withheld for tax withholdings, shares		(197,097)
Exercise of stock options	4,282	$ 2	4,280
Exercise of stock options, shares		234,977
Adjustments to previous dividend declarations	61		61
Repurchase of shares of treasury stock, at cost	(98,032)					(98,032)
Net income (loss)	44,788			44,788
Ending Balance at Dec. 31, 2018	265,194	$ 934	663,834	(148,955)	2,284	(252,903)
Ending Balance, shares at Dec. 31, 2018		93,400,929
Equity-based compensation	11,106		11,106
Unrealized gain (loss) on derivatives, net of tax	(3,843)				(3,843)
Vesting of restricted shares		$ 6	(6)
Vesting of restricted shares, shares		608,851
Shares withheld for tax withholdings	(4,841)	$ (2)	(4,839)
Shares withheld for tax withholdings, shares		(176,673)
Exercise of stock options	3,795	$ 2	3,793
Exercise of stock options, shares		211,096
Adjustments to previous dividend declarations	5		5
Repurchase of shares of treasury stock, at cost	(150,000)					(150,000)
Net income (loss)	89,476			89,476
Ending Balance at Dec. 31, 2019	$ 210,892	$ 940	673,893	(59,479)	(1,559)	(402,903)
Ending Balance, shares at Dec. 31, 2019	94,044,203	94,044,203
Equity-based compensation	$ 7,467		7,467
Unrealized gain (loss) on derivatives, net of tax	1,559				$ 1,559
Vesting of restricted shares		$ 6	(6)
Vesting of restricted shares, shares		609,286
Shares withheld for tax withholdings	(3,915)	$ (2)	(3,913)
Shares withheld for tax withholdings, shares		(158,865)
Exercise of stock options	$ 2,920	$ 2	2,918
Exercise of stock options, shares	157,624	157,624
Adjustments to previous dividend declarations	$ 1		1
Repurchase of shares of treasury stock, at cost	(12,406)					(12,406)
Net income (loss)	(312,321)			(312,321)
Ending Balance at Dec. 31, 2020	$ (105,803)	$ 946	$ 680,360	$ (371,800)		$ (415,309)
Ending Balance, shares at Dec. 31, 2020	94,652,248	94,652,248