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Goodwill and Acquired Intangible Assets
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets Goodwill and Acquired Intangible Assets
Acquired intangible assets that are subject to amortization consisted of the following as of December 31, 2020 and 2019 (in thousands):
 
 December 31, 2020December 31, 2019
Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Completed technologies$172,346 $(111,435)$60,911 $153,722 $(94,088)$59,634 
Customer-related intangible assets358,032 (186,733)171,299 279,684 (163,155)116,529 
Non-compete agreements373 (77)296 830 (529)301 
Trademarks and trade names7,658 (5,440)2,218 7,600 (4,633)2,967 
Acquired license rights490 (490)— 490 (490)— 
Total$538,899 $(304,175)$234,724 $442,326 $(262,895)$179,431 

Aggregate expense related to amortization of acquired intangible assets for the years ended December 31, 2020, 2019 and 2018 was $42.0 million, $38.6 million and $33.3 million, respectively. Based on the Company's acquired intangible assets as of December 31, 2020, aggregate expense related to amortization of acquired intangible assets is expected to be $47.4 million, $43.8 million, $36.3 million, $28.4 million and $22.9 million for the years ending December 31, 2021, 2022, 2023, 2024 and 2025, respectively.

The changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019 were as follows (in thousands):

 20202019
Beginning balance$1,600,265 $1,487,404 
Acquisition of Asavie Technologies Limited70,200 — 
Acquisition of Janrain, Inc. — 92,188 
Acquisition of Exceda— 14,712 
Acquisition of ChameleonX, Ltd.— 7,069 
Measurement period adjustments related to acquisitions completed in prior years(1,056)— 
Foreign currency translation4,962 (1,108)
Ending balance$1,674,371 $1,600,265