CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Warrants	Treasury Stock	Additional Paid-in-Capital	Retained Deficit	Total
Balance at Dec. 31, 2017	$ 253	$ 37,329	$ (1,603)	$ 524,755	$ (75,147)	$ 485,587
Increase (Decrease) in Stockholders' Equity
Share-based compensation	1			2,795		2,796
Acquisition of treasury stock			(459)			(459)
Net income/(loss)					4,004	4,004
Balance at Mar. 31, 2018	254	37,329	(2,062)	527,550	(71,143)	491,928
Balance at Dec. 31, 2018	255	37,329	(2,455)	531,911	(25,363)	541,677
Increase (Decrease) in Stockholders' Equity
Share-based compensation	1			(60)		(59)
Acquisition of treasury stock			(50,262)			(50,262)
Net income/(loss)					(17,807)	(17,807)
Retirement of treasury stock	(50)		50,000	(49,950)
Balance at Mar. 31, 2019	$ 206	$ 37,329	$ (2,717)	$ 481,901	$ (43,170)	$ 473,549