Statement of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 196	$ (198)	$ (164)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	646	(142)	(100)
Other Comprehensive Income (Loss), Tax	$ 842	$ (340)	$ (264)