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, 2017		16,796,884
Beginning Balance at Dec. 31, 2017	$ 352,066	$ 18	$ 223,055	$ 168,624	$ (7,822)	$ (31,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	455			455
Currency translation adjustment, net of income tax	5,214				5,214
Stock-based compensation	1,553		1,553
Common stock issued, net of shares withheld for employee taxes (in shares)		158,795
Common stock issued, net of shares withheld for employee taxes	6,676		6,601			75
Ending Balance (in shares) at Mar. 31, 2018		16,955,679
Ending Balance at Mar. 31, 2018	$ 368,329	$ 18	231,209	171,444	(2,608)	(31,734)
Beginning Balance (in shares) at Dec. 31, 2018	17,253,011	17,253,011
Beginning Balance at Dec. 31, 2018	$ 376,609	$ 19	251,329	175,353	(18,483)	(31,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	152			152
Currency translation adjustment, net of income tax	(1,564)				(1,564)
Stock-based compensation	2,564		2,564
Common stock issued, net of shares withheld for employee taxes (in shares)		64,864
Common stock issued, net of shares withheld for employee taxes	$ (846)		(1,053)			207
Ending Balance (in shares) at Mar. 31, 2019	17,317,875	17,317,875
Ending Balance at Mar. 31, 2019	$ 376,588	$ 19	$ 252,840	$ 175,178	$ (20,047)	$ (31,402)