Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - 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, 2018	$ 265,194	$ 934	$ 663,834	$ (148,955)	$ 2,284	$ (252,903)
Beginning Balance, shares at Dec. 31, 2018		93,400,929
Equity-based compensation	3,198		3,198
Unrealized gain (loss) on derivatives, net of tax	(2,064)				(2,064)
Vesting of restricted shares		$ 4	(4)
Vesting of restricted shares, shares		440,646
Shares withheld for tax withholdings	(3,606)	$ (1)	(3,605)
Shares withheld for tax withholdings, shares		(132,886)
Exercise of stock options	715		715
Exercise of stock options, shares		39,928
Adjustments to previous dividend declarations	3		3
Net income (Loss)	(37,020)			(37,020)
Ending Balance at Mar. 31, 2019	226,420	$ 937	664,141	(185,975)	220	(252,903)
Ending Balance, shares at Mar. 31, 2019		93,748,617
Beginning Balance at Dec. 31, 2018	265,194	$ 934	663,834	(148,955)	2,284	(252,903)
Beginning Balance, shares at Dec. 31, 2018		93,400,929
Unrealized gain (loss) on derivatives, net of tax	(4,556)
Net income (Loss)	113,659
Ending Balance at Sep. 30, 2019	231,703	$ 940	671,234	(35,296)	(2,272)	(402,903)
Ending Balance, shares at Sep. 30, 2019		94,012,743
Beginning Balance at Mar. 31, 2019	226,420	$ 937	664,141	(185,975)	220	(252,903)
Beginning Balance, shares at Mar. 31, 2019		93,748,617
Equity-based compensation	4,084		4,084
Unrealized gain (loss) on derivatives, net of tax	(2,866)				(2,866)
Vesting of restricted shares		$ 1	(1)
Vesting of restricted shares, shares		57,642
Shares withheld for tax withholdings	(362)		(362)
Shares withheld for tax withholdings, shares		(12,536)
Exercise of stock options	1,620	$ 1	1,619
Exercise of stock options, shares		91,248
Adjustments to previous dividend declarations	1		1
Repurchase of treasury shares	(150,000)					(150,000)
Net income (Loss)	52,651			52,651
Ending Balance at Jun. 30, 2019	131,548	$ 939	669,482	(133,324)	(2,646)	(402,903)
Ending Balance, shares at Jun. 30, 2019		93,884,971
Equity-based compensation	1,162		1,162
Unrealized gain (loss) on derivatives, net of tax	374				374
Vesting of restricted shares		$ 1	(1)
Vesting of restricted shares, shares		83,697
Shares withheld for tax withholdings	(653)	$ (1)	(652)
Shares withheld for tax withholdings, shares		(23,186)
Exercise of stock options	1,243	$ 1	1,242
Exercise of stock options, shares		67,261
Adjustments to previous dividend declarations	1		1
Net income (Loss)	98,028			98,028
Ending Balance at Sep. 30, 2019	231,703	$ 940	671,234	(35,296)	(2,272)	(402,903)
Ending Balance, shares at Sep. 30, 2019		94,012,743
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	94,044,203
Equity-based compensation	$ (3,601)		(3,601)
Unrealized gain (loss) 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 income (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, 2019	$ 210,892	$ 940	673,893	(59,479)	(1,559)	(402,903)
Beginning Balance, shares at Dec. 31, 2019	94,044,203	94,044,203
Unrealized gain (loss) on derivatives, net of tax	$ 1,559
Net income (Loss)	(266,785)
Ending Balance at Sep. 30, 2020	$ (66,521)	$ 944	674,108	(326,264)		(415,309)
Ending Balance, shares at Sep. 30, 2020	94,433,197	94,433,197
Beginning Balance at Mar. 31, 2020	$ 136,114	$ 943	667,333	(115,998)	(855)	(415,309)
Beginning Balance, shares at Mar. 31, 2020		94,345,017
Equity-based compensation	3,320		3,320
Unrealized gain (loss) on derivatives, net of tax	855				$ 855
Vesting of restricted shares		$ 1	(1)
Vesting of restricted shares, shares		71,530
Shares withheld for tax withholdings	(154)		(154)
Shares withheld for tax withholdings, shares		(8,987)
Exercise of stock options	15		15
Exercise of stock options, shares		818
Net income (Loss)	(131,029)			(131,029)
Ending Balance at Jun. 30, 2020	9,121	$ 944	670,513	(247,027)		(415,309)
Ending Balance, shares at Jun. 30, 2020		94,408,378
Equity-based compensation	3,484		3,484
Vesting of restricted shares, shares		18,818
Shares withheld for tax withholdings	(36)		(36)
Shares withheld for tax withholdings, shares		(1,999)
Exercise of stock options	147		147
Exercise of stock options, shares		8,000
Net income (Loss)	(79,237)			(79,237)
Ending Balance at Sep. 30, 2020	$ (66,521)	$ 944	$ 674,108	$ (326,264)		$ (415,309)
Ending Balance, shares at Sep. 30, 2020	94,433,197	94,433,197