Condensed Consolidated Statement of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2017 - 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, 2016	$ 461,215	$ 919	$ 621,343	$ 7,518	$ (13,694)	$ (154,871)
Beginning Balance, shares at Dec. 31, 2016	91,861,054	91,861,054
Equity-based compensation	$ 16,020		16,020
Unrealized gain on derivatives, net of tax	1,698				1,698
Vesting of restricted shares		$ 7	(7)
Vesting of restricted shares, shares		743,275
Shares withheld for tax withholdings	(1,470)	$ (1)	(1,469)
Shares withheld for tax withholdings, shares		(83,231)
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	9		(12)	21
Net loss	(236,979)			(236,979)
Ending Balance at Jun. 30, 2017	$ 239,234	$ 925	$ 634,616	$ (229,440)	$ (11,996)	$ (154,871)
Ending Balance, shares at Jun. 30, 2017	92,521,688	92,521,688