ACQUIRED INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2023

The following table details acquired intangible assets (in thousands):


	Balance at December 31, 2023
	Weighted Average Estimated Useful Life	Cost		Accumulated Amortization		Net
Technology assets	5 years	$	393,511	$	(201,409)	$	192,102
Customer assets	14 years	1,473,970		(237,316)		1,236,654
Trade names	9 years	428,944		(102,774)		326,170
Other	9 years	13,299		(6,704)		6,595
Total		$	2,309,724	$	(548,203)	$	1,761,521


	Balance at December 31, 2022
	Weighted Average Estimated Useful Life	Cost		Accumulated Amortization		Net
Technology assets	5 years	$	398,665	$	(133,116)	$	265,549
Customer assets	15 years	1,474,163		(110,316)		1,363,847
Trade names	9 years	434,766		(58,352)		376,414
Other	9 years	13,701		(5,477)		8,224
Total		$	2,321,295	$	(307,261)	$	2,014,034

The change in the carrying value of intangible assets was as follows (in thousands):


	Year Ended December 31,
	2023		2022		2021
Acquired intangible assets, net, beginning of the period	$	2,014,034	$	257,049	$	137,612
Acquisitions	6,300		2,006,490		159,100
Amortization expense	(246,873)		(208,952)		(40,522)

Foreign currency translation and other adjustments	(11,940)		(40,553)		859
Acquired intangible assets, net, end of the period	$	1,761,521	$	2,014,034	$	257,049

The estimated future amortization expense of intangible assets as of December 31, 2023 is as follows (in thousands):