CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Treasury stock
Beginning Balance (in shares) at Dec. 31, 2016		34,910
Beginning Balance at Dec. 31, 2016	$ 41,885	$ 34	$ 482,265	$ (440,478)	$ 6,931	$ (6,867)
Beginning Balance, treasury stock (in shares) at Dec. 31, 2016						3,145
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,941)			(2,941)
Other comprehensive income (loss), translation adjustments	3,844				3,844
Other comprehensive income (loss), pension liability adjustment	(66)				(66)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	0
Purchase of treasury stock (in shares)						650
Purchase of treasury stock	(858)					$ (858)
Purchase of restricted stock from employees (in shares)						(5)
Purchase of restricted stock from employees	(5)					$ (5)
Stock-based compensation and vesting of restricted stock units (in shares)		49
Stock-based compensation and vesting of restricted stock units	$ 1,293		1,293
Ending Balance, treasury stock (in shares) at Dec. 31, 2017	3,800					3,800
Ending Balance (in shares) at Dec. 31, 2017	31,159	34,959
Ending Balance at Dec. 31, 2017	$ 43,152	$ 34	483,558	(443,419)	10,709	$ (7,730)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,867			7,867
Other comprehensive income (loss), translation adjustments	(458)				(458)
Other comprehensive income (loss), pension liability adjustment	(38)				(38)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	(10,819)				(10,819)
Purchase of treasury stock (in shares)						145
Purchase of treasury stock	(208)					$ (208)
Purchase of restricted stock from employees (in shares)		285
Purchase of restricted stock from employees	(548)					$ (548)
Stock-based compensation and vesting of restricted stock units (in shares)		1,176
Stock-based compensation and vesting of restricted stock units	$ 1,539	$ 2	1,537
Ending Balance, treasury stock (in shares) at Dec. 31, 2018	4,230					4,230
Ending Balance (in shares) at Dec. 31, 2018	31,905	36,135
Ending Balance at Dec. 31, 2018	$ 40,487	$ 36	$ 485,095	$ (435,552)	$ (606)	$ (8,486)