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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]      
Beginning Balance $ 720,071 $ 605,244  
Acquired goodwill 35,956 113,404  
Acquisition purchase price adjustments   (301) 7,007
Foreign currency translation (5,220) 1,724  
Discontinued operations (6,474)    
Ending Balance 744,333 720,071 605,244
Strategic Marketing Services [Member]
      
Goodwill [Line Items]      
Beginning Balance 483,760 389,525  
Acquired goodwill 0 93,531  
Acquisition purchase price adjustments   (78)  
Foreign currency translation (2,374) 782  
Discontinued operations (3,981)    
Ending Balance 477,405 483,760  
Performance Marketing Services [Member]
      
Goodwill [Line Items]      
Beginning Balance 236,311 215,719  
Acquired goodwill 35,956 19,873  
Acquisition purchase price adjustments   (223)  
Foreign currency translation (2,846) 942  
Discontinued operations (2,493)    
Ending Balance $ 266,928 $ 236,311