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Business Combinations (Pro Forma Financial Information) (Details) (Convio, Inc [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Convio, Inc [Member]
   
Business Acquisition [Line Items]    
Revenue $ 476,887 $ 451,221
Net income (loss) $ 116 $ 27,697
Basic earnings (loss) per share $ 0.00 $ 0.64
Diluted earnings (loss) per share $ 0.00 $ 0.63