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Goodwill and Intangible Assets - Textual (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
reportable_segment
Dec. 31, 2018
USD ($)
reportable_segment
Dec. 31, 2017
USD ($)
reportable_segment
Goodwill [Line Items]          
Goodwill and other asset impairment $ 5,875 $ 56,732 $ 7,819 $ 80,057 $ 4,415
Number of Reporting Units | reportable_segment       3 2
Goodwill, Impairment Loss     4,099 $ 74,560  
Goodwill, impaired, accumulated impairment loss $ 177,304 $ 173,205 $ 177,304 173,205  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     8 years    
Amortization Of Intangible Assets, Finite Lived     $ 11,828 $ 17,290 $ 17,125
Customer Relationships          
Goodwill [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     7 years    
Other Intangible Assets          
Goodwill [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     9 years    
Global Integrated Agencies          
Goodwill [Line Items]          
Number of Reporting Units | reportable_segment       1 1
Impairment of Intangible Assets (Excluding Goodwill)       $ 3,180  
Media Services          
Goodwill [Line Items]          
Number of Reporting Units | reportable_segment       1 1
All Other          
Goodwill [Line Items]          
Number of Reporting Units | reportable_segment     1