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Goodwill and Acquired Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in the carrying amount of goodwill for the nine months ended September 30, 2018 was as follows (in thousands):

Balance as of January 1, 2018
$
1,498,688

Measurement period adjustments
(6,667
)
Foreign currency translation
(3,153
)
Balance as of September 30, 2018
$
1,488,868
Schedule of Acquired Intangible Assets
Acquired intangible assets that are subject to amortization consisted of the following as of September 30, 2018 and December 31, 2017 (in thousands):

 
September 30, 2018
 
December 31, 2017
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Completed technology
$
145,091

 
$
(77,512
)
 
$
67,579

 
$
145,091

 
$
(65,283
)
 
$
79,808

Customer-related intangible assets
245,710

 
(140,798
)
 
104,912

 
245,310

 
(128,835
)
 
116,475

Non-compete agreements
700

 
(256
)
 
444

 
4,710

 
(3,975
)
 
735

Trademarks and trade names
7,200

 
(3,495
)
 
3,705

 
7,200

 
(2,959
)
 
4,241

Acquired license rights
490

 
(490
)
 
—

 
490

 
(490
)
 
—

Total
$
399,191

 
$
(222,551
)
 
$
176,640

 
$
402,801

 
$
(201,542
)
 
$
201,259