Condensed Consolidated Statements of Changes in Stockholder's Equity (Deficit) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2017	$ (34,635)	$ 0	$ 12,075	$ 457,186	$ 794,583	$ (1,254,176)	$ (44,303)
Increase (Decrease) in Stockholders' Equity (Deficit)
Preferred stock issued	0	9,723
Stock Option activities	(1)		38	(38)		(1)
Rounding from reverse stock split	0		(38)	38
Stock-based compensation	433			433
Treasury stock issued	3			(50)		53
Net (loss) income	32,629				32,629
Other comprehensive income	364						364
Balance at Mar. 31, 2018	(636)	9,723	12,075	457,569	827,783	(1,254,124)	(43,939)
Balance at Dec. 31, 2018	(19,184)	9,723	12,115	453,868	812,704	(1,251,388)	(46,483)
Increase (Decrease) in Stockholders' Equity (Deficit)
Stock-based compensation	151			151
Treasury stock issued	16			(1,968)		1,984
Net (loss) income	(13,527)				(13,527)
Other comprehensive income	522						522
Balance at Mar. 31, 2019	$ (32,000)	$ 9,723	$ 12,115	$ 452,051	$ 810,554	$ (1,249,404)	$ (57,316)