Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Comprehensive Income (Parenthetical)

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Condensed Consolidated Statements of Comprehensive Income (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
Statement Of Income And Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax $ 1,615 $ (1,506) $ 1,542 $ (1,811)
Unrealized (loss) gain on derivatives, tax (210) 2,211 (314) 1,704
Unrealized gain on available-for-sale investments, tax $ 121   $ 70