Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical)

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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax $ (1,799) $ 579 $ (3,610) $ (1,493)
Unrealized gain (loss) on derivatives, tax $ (214) $ (1,038) $ 1,490 $ (1,377)