Condensed Consolidated Statement of Changes in Stockholders' Equity - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock, at Cost [Member]
Beginning Balance at Dec. 31, 2017	$ 287,466	$ 926	$ 641,324	$ (194,837)	$ (5,076)	$ (154,871)
Beginning Balance, shares at Dec. 31, 2017	92,637,403	92,637,403
Impact of adoption of ASU 2018-02				1,094	(1,094)
Equity-based compensation	$ 7,545		7,545
Unrealized gain on derivatives, net of tax	7,491				7,491
Vesting of restricted shares		$ 4	(4)
Vesting of restricted shares, shares		360,092
Shares withheld for tax withholdings	(1,634)	$ (1)	(1,633)
Shares withheld for tax withholdings, shares		(108,432)
Exercise of stock options	$ 7		7
Exercise of stock options, shares	484	484
Adjustments to previous dividend declarations	$ 47		47
Net loss	(62,844)			(62,844)
Ending Balance at Mar. 31, 2018	$ 238,078	$ 929	$ 647,286	$ (256,587)	$ 1,321	$ (154,871)
Ending Balance, shares at Mar. 31, 2018	92,889,547	92,889,547