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Goodwill and Acquired Intangible Assets, Net (Tables)
9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of acquired intangible assets and goodwill activity
A summary of acquired intangible assets and goodwill activity for the nine months ended September 30, 2020 is presented below:
(in thousands)
 
Acquired
Intangible
Assets
 
Goodwill
 
Total
Intangible
Assets
Balance as of December 31, 2019
 
$
141,847

 
$
743,823

 
$
885,670

Increases (decreases):
 
 
 
 
 
 
Acquisition
 
926

 
(474
)
 
452

Amortization
 
(17,020
)
 

 
(17,020
)
Impairment

(1,467
)

(104,554
)

(106,021
)
Other (primarily changes in foreign currency exchange rates)
 
(709
)
 
3,091

 
2,382

Balance as of September 30, 2020
 
$
123,577

 
$
641,886

 
$
765,463