Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Stockholders' Equity (Deficit)
Cumulative effect of accounting change	$ (164)			$ 709	$ (873)
Balance at Dec. 31, 2016	2,656	$ 0	$ 12,044	458,638	837,316	$ (1,259,164)	$ (46,178)
Increase (Decrease) in Stockholders' Equity (Deficit)
Exercise of stock options and release of unvested shares	(92)		4	(4)		(92)
Stock-based compensation	1,110			1,110
Treasury stock issued	104			(1,984)		2,088
Net income/(loss)	(10,039)				(10,039)
Other comprehensive income (loss)	1,395						1,395
Balance at Jun. 30, 2017	(5,030)	0	12,048	458,469	826,404	(1,257,168)	(44,783)
Increase (Decrease) in Stockholders' Equity (Deficit)
Cumulative effect of accounting change	571				571
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
Exercise of stock options and release of unvested shares	(70)		71	(71)		(70)
Payout of Reverse Stock Split shares eliminated due to rounding	0		(38)	38
Stock-based compensation	858			858
Treasury stock issued	37			(805)		842
Net income/(loss)	25,893				25,893
Other comprehensive income (loss)	76						76
Balance at Jun. 30, 2018	$ (7,270)	$ 9,723	$ 12,108	$ 457,206	$ 821,047	$ (1,253,404)	$ (44,227)