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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]

As of December 31, the gross and net amounts of acquired intangible assets were as follows:

 

GoodwillStrategic Marketing ServicesPerformance Marketing ServicesTotal
Balance as of December 31, 2010$326,977$187,511$514,488
Acquired goodwill61,94423,76385,707
Acquisition purchase price adjustments1,4585,5497,007
Foreign currency translation(854)(1,104)(1,958)
Balance as of December 31, 2011$389,525$215,719$605,244
Acquired goodwill93,53119,873113,404
Acquisition purchase price adjustments(78)(223)(301)
Foreign currency translation7829421,724
Balance as of December 31, 2012$483,760$236,311$720,071
Schedule of Intangible Assets Excluding Goodwill [Table Text Block]

 

   
  For the Year Ended December 31,
     2012   2011
Intangibles:                  
Trademarks (indefinite life)   $ 17,780     $ 17,780  
Customer relationships – gross   $ 104,070     $ 79,154  
Less accumulated amortization     (66,108 )      (44,803 ) 
Customer relationships – net   $ 37,962     $ 34,351  
Other intangibles – gross   $ 20,908     $ 16,202  
Less accumulated amortization     (13,407 )      (10,353 ) 
Other intangibles – net   $ 7,501     $ 5,849  
Total intangible assets   $ 142,758     $ 113,136  
Less accumulated amortization     (79,515 )      (55,156 ) 
Total intangible assets – net   $ 63,243     $ 57,980  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

  the estimated amortization expense for the five succeeding years is:

 

YearAmortization
2013$18,363
2014$12,851
2015$7,026
2016$3,662
2017$1,239