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	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2016		23,125
Beginning balance at Dec. 31, 2016	$ 427,569	$ 23	$ 495,468	$ (173,231)	$ 6,661	$ (927)	$ 99,575
Beginning balance, treasury shares (in shares) at Dec. 31, 2016						55
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,171		1,872				299
Exercise of restricted stock units (in shares)		76
Exercise of restricted stock units	0
Withholding taxes paid on vested restricted stock units	(952)		(831)				(121)
Changes in ownership of noncontrolling interest	0		(465)				465
Distribution to noncontrolling interest	(26)						(26)
Purchases of treasury stock (in shares)						47
Purchases of treasury stock	(690)					$ (690)
Retirement of treasury stock (in shares)		(47)				(47)
Retirement of treasury stock	0		(690)			$ 690
Distribution of treasury stock to deferred compensation plan participants (in shares)						(54)
Distribution of treasury stock to deferred compensation plan participants	796		(106)			$ 902
Deconsolidation of noncontrolling interest in conjunction with sale of consolidated subsidiary	(101,342)						(101,342)
Special dividend paid	(115,860)		(115,860)
Net income (loss)	1,614			464			1,150
Unrealized loss on securities, net of deferred income tax and reclassification adjustments	(6,193)				(6,193)
Foreign currency translation	$ 76				76
Ending balance (in shares) at Dec. 31, 2017	23,153	23,154
Ending balance at Dec. 31, 2017	$ 207,163	$ 23	379,388	(172,767)	544	$ (25)	$ 0
Ending balance, treasury shares (in shares) at Dec. 31, 2017	1					1
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	$ (544)
Ending balance (in shares) at Dec. 31, 2018	20,848	20,848
Ending balance at Dec. 31, 2018	$ 176,624	$ 21	$ 353,250	$ (175,536)	$ 0	$ (1,111)
Ending balance, treasury shares (in shares) at Dec. 31, 2018	121					121