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, 2017	$ 193,458	$ 116	$ 279,111	$ (1,452)	$ (84,317)
Shares issued from option exercise	708	0	708	0	0
Purchase of treasury shares	(290)	0	0	(290)	0
Issuance of restricted stock	0	1	(1)	0	0
Amortization of share-based compensation	1,485	0	1,485	0	0
Net Income (Loss)	8,466	0	0	0	8,466
Ending Balance at Mar. 31, 2018	203,827	117	281,303	(1,742)	(75,851)
Beginning Balance at Dec. 31, 2018	274,827	118	286,281	(1,870)	(9,702)
Purchase of treasury shares	(260)	0	0	(260)	0
Issuance of restricted stock	0	0	0	0	0
Amortization of share-based compensation	1,849	0	1,849	0	0
Net Income (Loss)	16,053	0	0	0	16,053
Ending Balance at Mar. 31, 2019	$ 292,469	$ 118	$ 288,130	$ (2,130)	$ 6,351