CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other comprehensive income (loss):
Currency translation adjustment, tax	$ 0	$ (180)	$ (194)	$ (57)
Unrealized holding gain on marketable securities arising during the period, tax	(54)	(7)	(39)	58
Change in unfunded SERP liability, tax	$ 28	$ 14	$ 84	$ 42