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Goodwill and Acquired Intangible Assets
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets Goodwill and Acquired Intangible Assets
The change in the carrying amount of goodwill for the nine months ended September 30, 2020 was as follows (in thousands):

Balance as of January 1, 2020$1,600,265 
Measurement period adjustments related to acquisitions completed in prior years(1,056)
Foreign currency translation(290)
Balance as of September 30, 2020$1,598,919 

The Company tests goodwill for impairment at least annually. Through the date the consolidated financial statements were issued, no triggering events had occurred that would indicate a potential impairment exists.
Acquired intangible assets that are subject to amortization consisted of the following as of September 30, 2020 and December 31, 2019 (in thousands):

 September 30, 2020December 31, 2019
 Gross
Carrying
Amount		Accumulated AmortizationNet
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Completed technology$154,343 $(106,730)$47,613 $153,722 $(94,088)$59,634 
Customer-related intangible assets315,087 (180,658)134,429 279,684 (163,155)116,529 
Non-compete agreements816 (721)95 830 (529)301 
Trademarks and trade names7,543 (5,202)2,341 7,600 (4,633)2,967 
Acquired license rights490 (490)— 490 (490)— 
Total$478,279 $(293,801)$184,478 $442,326 $(262,895)$179,431 

Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2020 was $10.3 million and $31.2 million, respectively. Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2019 was $9.6 million and $28.9 million, respectively. Based on the Company’s acquired intangible assets as of September 30, 2020, aggregate expense related to amortization of acquired intangible assets is expected to be $10.5 million for the remainder of 2020, and $43.0 million, $37.3 million, $28.9 million and $20.5 million for 2021, 2022, 2023 and 2024, respectively.