The changes in the carrying amount of goodwill for the three months ended March 31, 2024 by reportable segment were as follows (in thousands):


	Americas			International			Total
Balance – December 31, 2023	$	703,797		$	116,857		$	820,654
Adjustments to initial purchase price allocations		(25	)		—			(25	)
Foreign currency translation		12			(1,008	)		(996	)
Balance – March 31, 2024	$	703,784		$	115,849		$	819,633

The following summarizes the gross carrying value and accumulated amortization for the Company’s trade names, customer lists, and other intangible assets as of March 31, 2024 and December 31, 2023 (in thousands):


	March 31, 2024
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Useful Life (in years)
Trade names	$	96,208	$	(31,838	)	$	64,370	20 years
Customer lists		519,543		(256,667	)		262,876	13-14 years
Other intangible assets		2,400		(262	)		2,138	5 years
Total	$	618,151	$	(288,767	)	$	329,384


	December 31, 2023
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Useful Life (in years)
Trade names	$	96,321	$	(30,092	)	$	66,229	20 years
Customer lists		520,105		(244,577	)		275,528	13-14 years
Other intangible assets		2,400		(143	)		2,257	5 years
Total	$	618,826	$	(274,812	)	$	344,014

Amortization expense of trade names, customer lists, and other intangible assets was approximately $14.3 million and $15.4 million for the three months ended March 31, 2024 and 2023, respectively. Trade names and customer lists are amortized on an accelerated basis based upon their estimated useful life. Other intangible assets are amortized on a straight-line or accelerated basis over their expected useful life of five years.