Condensed Consolidated Statements of Changes in Stockholders' 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 income (loss)	32,627				32,627
Other comprehensive income (loss)	364						364
Balance at Mar. 31, 2018	(638)	9,723	12,075	457,569	827,781	(1,254,124)	(43,939)
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)
Net income (loss)	15,909
Other comprehensive income (loss)	345
Balance at Sep. 30, 2018	(18,453)	9,723	12,115	455,008	811,063	(1,252,681)	(43,958)
Balance at Mar. 31, 2018	(638)	9,723	12,075	457,569	827,781	(1,254,124)	(43,939)
Increase (Decrease) in Stockholders' Equity (Deficit)
Stock Option activities	(69)		33	(33)		(69)
Stock-based compensation	425			425
Treasury stock issued	34			(755)		789
Net income (loss)	(6,734)				(6,734)
Other comprehensive income (loss)	(288)						(288)
Balance at Jun. 30, 2018	(7,270)	9,723	12,108	457,206	821,047	(1,253,404)	(44,227)
Increase (Decrease) in Stockholders' Equity (Deficit)
Stock Option activities	(35)		7	(78)		36
Stock-based compensation	(1,461)			(1,461)
Treasury stock issued	28			(659)		687
Net income (loss)	(9,984)				(9,984)
Other comprehensive income (loss)	269						269
Balance at Sep. 30, 2018	(18,453)	9,723	12,115	455,008	811,063	(1,252,681)	(43,958)
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 income (loss)	(13,527)				(13,527)
Other comprehensive income (loss)	522						522
Balance at Mar. 31, 2019	(32,000)	9,723	12,115	452,051	810,554	(1,249,404)	(57,316)
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)
Net income (loss)	(23,318)
Other comprehensive income (loss)	(10,018)
Balance at Sep. 30, 2019	(40,429)	9,723	12,121	447,244	800,763	(1,244,056)	(56,501)
Balance at Mar. 31, 2019	(32,000)	9,723	12,115	452,051	810,554	(1,249,404)	(57,316)
Increase (Decrease) in Stockholders' Equity (Deficit)
Stock Option activities	(2)		6	(8)
Stock-based compensation	239			239
Treasury stock issued	(2)			(345)		343
Net income (loss)	(3,803)				(3,803)
Other comprehensive income (loss)	926						926
Balance at Jun. 30, 2019	(34,642)	9,723	12,121	451,937	806,751	(1,249,061)	(56,390)
Increase (Decrease) in Stockholders' Equity (Deficit)
Stock-based compensation	312			312
Treasury stock issued	0			(5,005)		5,005
Net income (loss)	(5,988)				(5,988)
Other comprehensive income (loss)	(111)						(111)
Balance at Sep. 30, 2019	$ (40,429)	$ 9,723	$ 12,121	$ 447,244	$ 800,763	$ (1,244,056)	$ (56,501)