CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Common Stock in Treasury
Beginning Balance (in shares) at Dec. 31, 2016		16,680,791
Beginning Balance at Dec. 31, 2016	$ 339,657	$ 18	$ 212,602	$ 183,436	$ (24,561)	$ (31,838)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(14,516)			(14,516)
Currency translation adjustment, net of income tax	16,739				16,739
Restricted stock issued and stock based compensation under incentive plans (in shares)		19,881
Restricted stock issued and stock based compensation under incentive plans	6,450		6,450
Stock options exercised, net of shares withheld for employee taxes (in shares)		86,994
Stock options exercised, net of shares withheld for employee taxes	3,284		3,284
Reissuance of treasury shares (in shares)		9,218
Reissuance of treasury shares	310		281			29
Ending Balance (in shares) at Dec. 31, 2017		16,796,884
Ending Balance at Dec. 31, 2017	352,066	$ 18	223,055	168,624	(7,822)	(31,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	4,930			4,930
Currency translation adjustment, net of income tax	(10,661)				(10,661)
Restricted stock issued and stock based compensation under incentive plans (in shares)		15,960
Restricted stock issued and stock based compensation under incentive plans	7,620		7,620
Stock options exercised, net of shares withheld for employee taxes (in shares)		382,957
Stock options exercised, net of shares withheld for employee taxes	17,028	$ 1	17,027
Reissuance of treasury shares (in shares)		57,210
Reissuance of treasury shares	$ 3,827		3,627			200
Ending Balance (in shares) at Dec. 31, 2018	17,253,011	17,253,011
Ending Balance at Dec. 31, 2018	$ 376,609	$ 19	251,329	175,353	(18,483)	(31,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(62,147)
Currency translation adjustment, net of income tax	1,084				1,084
Restricted stock issued and stock based compensation under incentive plans (in shares)		88,606
Restricted stock issued and stock based compensation under incentive plans	11,071		11,071
Stock options exercised, net of shares withheld for employee taxes (in shares)		224,214
Stock options exercised, net of shares withheld for employee taxes	5,468		5,468
Reissuance of treasury shares (in shares)		10,787
Reissuance of treasury shares	$ 234					234
Ending Balance (in shares) at Dec. 31, 2019	17,576,618	17,576,618
Ending Balance at Dec. 31, 2019	$ 331,992	$ 19	$ 267,868	$ 112,879	$ (17,399)	$ (31,375)