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Condensed Consolidated Statements Of Operations And Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Operations And Comprehensive Income [Abstract]    
Foreign currency translation, tax $ (45) $ 12
Change in unrealized gains on investments, tax $ (7) $ 0