CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other comprehensive income:
Currency translation adjustment, tax	$ 89	$ 5	$ 123	$ (216)
Unrealized holding losses on marketable securities arising during the period, tax	48	(63)	65	(11)
Change in unfunded SERP liability, tax	$ 14	$ 24	$ 28	$ (4)