Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings (Accumulated Deficit)
Beginning Balance at Dec. 31, 2016	$ 76,055	$ 101	$ 232,917	$ (675)	$ (156,288)
Purchase of treasury shares	(777)	0	0	(777)	0
Issuance of common stock	39,180	14	39,166	0	0
Issuance of restricted stock	0	1	(1)	0	0
Amortization of share-based compensation	7,029	0	7,029	0	0
Net Income (Loss)	71,971	0	0	0	71,971
Ending Balance at Dec. 31, 2017	193,458	116	279,111	(1,452)	(84,317)
Shares issued from option exercise	708	0	708	0	0
Purchase of treasury shares	(418)	0	0	418	0
Issuance of restricted stock	0	1	(1)	0	0
Amortization of share-based compensation	2,908	0	2,908	0	0
Net Income (Loss)	10,787	0	0	0	10,787
Ending Balance at Jun. 30, 2018	$ 207,443	$ 117	$ 282,726	$ (1,870)	$ (73,530)