CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock, at Cost
Beginning balance (in shares) at Dec. 31, 2018		20,848
Beginning balance, treasury shares (in shares) at Dec. 31, 2018					121
Beginning balance at Dec. 31, 2018	$ 176,624	$ 21	$ 353,250	$ (175,536)	$ (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)		(782)			(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	20,067	20,067
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)	$ (2,989)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	540		540
Purchases of treasury stock (in shares)					1,200
Purchases of treasury stock	(10,380)				$ (10,380)
Retirement of treasury stock (in shares)		(1,481)			(1,481)
Retirement of treasury stock	0	$ (1)	(13,338)		$ 13,339
Distribution to noncontrolling interest	(146)		(146)
Net income (loss)	$ 10,001			10,001
Ending balance (in shares) at Dec. 31, 2020	18,586	18,586
Ending balance, treasury shares (in shares) at Dec. 31, 2020	3				3
Ending balance at Dec. 31, 2020	$ 178,270	$ 19	$ 332,290	$ (154,009)	$ (30)