Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Stockholders' Equity [Abstract]
Foreign currency translation adjustment, tax expense\benefit	$ 190	$ 926	$ (1,799)
Unrealized gain on securities available-for-sale, tax expense\benefit	157	(115)	(1,093)
Unrealized loss on derivative instruments, tax expense\benefit	$ 161	$ 1,705	$ (3,053)