CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Warrants	Treasury Stock	Additional Paid-in-Capital	Retained Earnings (Deficit)	Total
Balance at Dec. 31, 2016	$ 250	$ 37,329		$ 514,305	$ 9,930	$ 561,814
Increase (Decrease) in Stockholders' Equity
Share-based compensation				3,790		3,790
Net income					18,485	18,485
Balance at Mar. 31, 2017	250	37,329		518,095	28,415	584,089
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					4,004	4,004
Balance at Mar. 31, 2018	$ 254	$ 37,329	$ (2,062)	$ 527,550	$ (71,143)	$ 491,928