Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock, at Cost [Member]
Beginning Balance at Dec. 31, 2014	$ 579,535	$ 902	$ 655,471	$ 33,516	$ (483)	$ (109,871)
Beginning Balance, shares at Dec. 31, 2014		90,191,100
Equity-based compensation	6,527		6,527
Unrealized gain (loss) on derivatives, net of tax	(12,654)				(12,654)
Vesting of restricted shares		$ 2	(2)
Vesting of restricted shares, shares		171,495
Shares withheld for tax withholdings	(844)	$ (1)	(843)
Shares withheld for tax withholdings, shares		(42,221)
Cash dividends declared to stockholders, net of forfeitures	(72,577)		(36,388)	(36,189)
Repurchase of shares of treasury stock, at cost	(45,000)					(45,000)
Net (loss) income	49,133			49,133
Ending Balance at Dec. 31, 2015	504,120	$ 903	624,765	46,460	(13,137)	(154,871)
Ending Balance, shares at Dec. 31, 2015		90,320,374
Equity-based compensation	37,515		37,515
Unrealized gain (loss) on derivatives, net of tax	(557)				(557)
Vesting of restricted shares		$ 16	(16)
Vesting of restricted shares, shares		1,625,529
Shares withheld for tax withholdings	(1,629)		(1,629)
Shares withheld for tax withholdings, shares		(89,180)
Exercise of stock options	82		82
Exercise of stock options, shares		4,331
Accumulated cash dividends related to performance shares which vested during the period	(3,400)		(3,400)
Cash dividends declared to stockholders, net of forfeitures	(62,385)		(35,974)	(26,411)
Net (loss) income	(12,531)			(12,531)
Ending Balance at Dec. 31, 2016	$ 461,215	$ 919	621,343	7,518	(13,694)	(154,871)
Ending Balance, shares at Dec. 31, 2016	91,861,054	91,861,054
Equity-based compensation	$ 23,203		23,203
Unrealized gain (loss) on derivatives, net of tax	8,618				8,618
Vesting of restricted shares		$ 9	(9)
Vesting of restricted shares, shares		905,052
Shares withheld for tax withholdings	(2,088)	$ (2)	(2,086)
Shares withheld for tax withholdings, shares		(129,293)
Exercise of stock options	$ 11		11
Exercise of stock options, shares	590	590
Accumulated cash dividends related to performance shares which vested during the period	$ (1,270)		(1,270)
Adjustments to previous dividend declarations	163		132	31
Net (loss) income	(202,386)			(202,386)
Ending Balance at Dec. 31, 2017	$ 287,466	$ 926	$ 641,324	$ (194,837)	$ (5,076)	$ (154,871)
Ending Balance, shares at Dec. 31, 2017	92,637,403	92,637,403