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Goodwill and Acquired Intangible Assets, Net (Tables)
9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block]
A summary of acquired intangible assets and goodwill activity for the nine months ended September 30, 2019 is presented below:
(in thousands)
 
Acquired
Intangible
Assets
 
Goodwill
 
Total
Intangible
Assets
Balance as of December 31, 2018
 
$
114,485

 
$
704,197

 
$
818,682

Increases (decreases):
 
 
 
 
 
 
Acquisition
 

 
686

 
686

Amortization
 
(15,320
)
 

 
(15,320
)
Other (primarily changes in foreign currency exchange rates)
 
(2,929
)
 
(18,892
)
 
(21,821
)
Balance as of September 30, 2019
 
$
96,236

 
$
685,991

 
$
782,227