CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Abstract]
Foreign currency translation adjustment, tax effect	$ (194)	$ (219)	$ 77
Unrealized holding gains (losses) on marketable securities, tax effect	5	90	45
Reclassification adjustment of unrealized holding gains (losses) included in net earnings, tax effect	0	0	(37)
Change in unfunded SERP liability, tax	$ 2	$ (631)	$ 457