CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock, at Cost
Beginning balance (in shares) at Dec. 31, 2017		23,154
Beginning balance, treasury shares (in shares) at Dec. 31, 2017						1
Beginning balance at Dec. 31, 2017	$ 207,163	$ 23	$ 379,388	$ (172,767)	$ 544	$ (25)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	425		425
Exercise of restricted stock units (in shares)		28
Exercise of restricted stock units	0
Withholding taxes paid on vested restricted stock units	(55)		(55)
Purchases of treasury stock (in shares)						2,455
Purchases of treasury stock	(27,621)					$ (27,621)
Retirement of treasury stock (in shares)		(2,334)				(2,334)
Retirement of treasury stock	0	$ (2)	(26,508)			$ 26,510
Distribution of treasury stock to deferred compensation plan participants (in shares)						(1)
Distribution of treasury stock to deferred compensation plan participants	25					$ 25
Net income (loss)	(3,329)			(3,329)
Unrealized loss on securities, net of deferred income tax and reclassification adjustments	$ 16			560	(544)
Ending balance (in shares) at Dec. 31, 2018	20,848	20,848
Ending balance, treasury shares (in shares) at Dec. 31, 2018	121					121
Ending balance at Dec. 31, 2018	$ 176,624	$ 21	353,250	(175,536)	0	$ (1,111)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	87		87
Exercise of restricted stock units (in shares)		1
Exercise of restricted stock units	0
Withholding taxes paid on vested restricted stock units	(5)		(5)
Purchases of treasury stock (in shares)						944
Purchases of treasury stock	(9,977)					$ (9,977)
Retirement of treasury stock (in shares)		(781)				(781)
Retirement of treasury stock	0	$ (1)	(8,098)			$ 8,099
Net income (loss)	$ 11,526			11,526
Ending balance (in shares) at Dec. 31, 2019	20,068	20,068
Ending balance, treasury shares (in shares) at Dec. 31, 2019	284					284
Ending balance at Dec. 31, 2019	$ 178,255	$ 20	$ 345,234	$ (164,010)	$ 0	$ (2,989)