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ACQUIRED INTANGIBLE ASSETS (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Finite Lived Intangible Assets
The following table presents the detail of acquired intangible assets as of the periods presented (in thousands):
Balance at September 30, 2021
Weighted Average Estimated Useful LifeCostAccumulated AmortizationNet
Technology assets5 years$165,255 $(59,085)$106,170 
Customer assets15 years128,418 (16,805)111,613 
Trade name9 years53,194 (12,355)40,839 
Other9 years13,710 (3,640)10,070 
Total$360,577 $(91,885)$268,692 
Balance at December 31, 2020
Weighted Average Estimated Useful LifeCostAccumulated AmortizationNet
Technology assets5 years$119,508 $(43,084)$76,424 
Customer assets11 years58,556 (10,796)47,760 
Trade name6 years18,529 (8,031)10,498 
Other8 years5,733 (2,803)2,930 
Total$202,326 $(64,714)$137,612 
The changes to the carrying value of intangible assets were as follows (in thousands):
Three Months Ended
September 30,
Nine Months Ended
September 30,
2021202020212020
Acquired intangible assets, net, beginning of the period$262,196 $99,802 $137,612 $69,079 
Acquisitions18,100 12,100 159,100 51,109 
Amortization expense(11,140)(5,236)(27,258)(13,522)
Other(464)896 (762)896 
Acquired intangible assets, net, end of the period$268,692 $107,562 $268,692 $107,562 
Future Amortization Expense of Intangible Assets The estimated future amortization expense of intangible assets in future periods as of September 30, 2021 is as follows (in thousands):
Remainder of 2021$11,250 
202242,971 
202341,720 
202438,742 
202531,915 
Thereafter102,094 
Total$268,692