CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock in Treasury
Beginning Balance (in shares) at Dec. 31, 2014		17,317,430
Beginning Balance at Dec. 31, 2014	$ 343,854	$ 18	$ 200,090	$ 159,516	$ (6,695)	$ (9,075)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	12,813			12,813
Currency translation adjustment, net of income tax	(13,166)				(13,166)
Restricted stock issued and stock based compensation under incentive plans (in shares)		13,143
Restricted stock issued and stock based compensation under incentive plans	4,306		4,306
Stock options exercised, net of shares withheld for employee taxes (in shares)		66,786
Stock options exercised, net of shares withheld for employee taxes	2,287		2,287
Tax impact from restricted stock and stock options	313		313
Repurchase of common stock (in shares)		(809,241)
Repurchase of common stock	(22,763)					(22,763)
Ending Balance (in shares) at Dec. 31, 2015		16,588,118
Ending Balance at Dec. 31, 2015	327,644	$ 18	206,996	172,329	(19,861)	(31,838)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	11,107			11,107
Currency translation adjustment, net of income tax	(4,700)				(4,700)
Restricted stock issued and stock based compensation under incentive plans (in shares)		20,925
Restricted stock issued and stock based compensation under incentive plans	5,374		5,374
Stock options exercised, net of shares withheld for employee taxes (in shares)		71,748
Stock options exercised, net of shares withheld for employee taxes	674		674
Tax impact from restricted stock and stock options	$ (442)		(442)
Ending Balance (in shares) at Dec. 31, 2016	16,680,791	16,680,791
Ending Balance at Dec. 31, 2016	$ 339,657	$ 18	212,602	183,436	(24,561)	(31,838)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of the adoption of ASU 2016-09	142		438	(296)
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	16,796,884
Ending Balance at Dec. 31, 2017	$ 352,066	$ 18	$ 223,055	$ 168,624	$ (7,822)	$ (31,809)