Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock, at Cost [Member]
Beginning Balance at Dec. 31, 2013	$ 648,027	$ 899	$ 689,394	$ 1,886	$ 11	$ (44,163)
Beginning Balance, shares at Dec. 31, 2013		89,900,453
Equity-based compensation	2,349		2,349
Unrealized loss on derivatives, net of tax	(494)				(494)
Vesting of restricted shares		$ 3	(3)
Vesting of restricted shares, shares		299,583
Shares withheld for tax withholdings	(213)		(213)
Shares withheld for tax withholdings, shares		(8,936)
Cash dividends declared to stockholders, net of forfeitures	(54,345)		(36,056)	(18,289)
Repurchase of shares of treasury stock, at cost	(65,708)					(65,708)
Net (loss) income	49,919			49,919
Ending Balance at Dec. 31, 2014	579,535	$ 902	655,471	33,516	(483)	(109,871)
Ending Balance, shares at Dec. 31, 2014		90,191,100
Equity-based compensation	6,527		6,527
Unrealized 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	90,320,374
Equity-based compensation	$ 37,515		37,515
Unrealized 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	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