Interim Condensed Consolidated Statements of Stockholders' Equity - 3 months ended Mar. 31, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2015	$ 360,469	$ 1,139	$ 96,778	$ (426)	$ 299,057	$ (36,079)
Balance (shares) at Dec. 31, 2015		11,350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,659				8,659
Translation adjustment	3,559					3,559
Net actuarial gain arising during period	166					166
Stock-based compensation	285		285
Exercise of stock options	317	$ 2	315
Exercise of stock options (shares)		18
Dividends paid ($.09 per share)	(1,025)				(1,025)
Balance at Mar. 31, 2016	$ 372,430	$ 1,141	$ 97,378	$ (426)	$ 306,691	$ (32,354)
Balance (shares) at Mar. 31, 2016		11,368