Condensed Consolidated Statements of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive 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	90,191,100
Equity-based compensation	$ 3,251		3,251
Unrealized loss on derivatives, net of tax	(4,620)				(4,620)
Vesting of restricted shares		$ 1	(1)
Vesting of restricted shares, shares		154,325
Shares withheld for tax withholdings	(836)		(836)
Shares withheld for tax withholdings, shares		(41,838)
Cash dividends declared to stockholders, net of forfeitures	(54,482)		(36,388)	(18,094)
Net loss	(37,789)			(37,789)
Ending Balance at Jun. 30, 2015	$ 485,059	$ 903	$ 621,497	$ (22,367)	$ (5,103)	$ (109,871)
Ending Balance, shares at Jun. 30, 2015	90,303,587	90,303,587