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Consolidated Statements of Operations and Comprehensive Income (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
Income Statement [Abstract]        
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges $ (491) $ (260) $ 161 $ (177)
Tax on foreign currency translation adjustments 0 0 0 0
Tax (benefit) expense on unrealized gain (loss) on investments $ 26 $ 44 $ (11) $ 2