Condensed Consolidated Statement of Changes in Stockholders' Equity - 9 months ended Sep. 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	$ 19,265		19,265
Unrealized gain on derivatives, net of tax	3,704				3,704
Vesting of restricted shares		$ 8	(8)
Vesting of restricted shares, shares		782,637
Shares withheld for tax withholdings	(1,613)	$ (1)	(1,612)
Shares withheld for tax withholdings, shares		(94,280)
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	139		108	31
Net loss	(181,945)			(181,945)
Ending Balance at Sep. 30, 2017	$ 299,506	$ 926	$ 637,837	$ (174,396)	$ (9,990)	$ (154,871)
Ending Balance, shares at Sep. 30, 2017	92,550,001	92,550,001