Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [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
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
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
Beginning Balance at Dec. 31, 2018	$ 265,194	$ 934	663,834	(148,955)	2,284	(252,903)
Beginning Balance, shares at Dec. 31, 2018	93,400,929	93,400,929
Equity-based compensation	$ 3,198		3,198
Unrealized gain on derivatives, net of tax	(2,064)				(2,064)
Vesting of restricted shares		$ 4	(4)
Vesting of restricted shares, shares		440,646
Shares withheld for tax withholdings	(3,606)	$ (1)	(3,605)
Shares withheld for tax withholdings, shares		(132,886)
Exercise of stock options	$ 715		715
Exercise of stock options, shares	39,928	39,928
Adjustments to previous dividend declarations	$ 3		3
Net loss	(37,020)			(37,020)
Ending Balance at Mar. 31, 2019	$ 226,420	$ 937	$ 664,141	$ (185,975)	$ 220	$ (252,903)
Ending Balance, shares at Mar. 31, 2019	93,748,617	93,748,617