The carrying amounts of external-use software development costs as of March 31, 2024 and December 31, 2023 were as follows:


	March 31, 2024		December 31, 2023

	(In thousands)
Gross carrying amount	$	242,580	$	239,038
Accumulated amortization	(179,040)		(172,379)
External-use software development costs, net (1)	$	63,540	$	66,659

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(1) Included in other long-term assets in the Condensed Consolidated Balance Sheets.

The Company recorded $6.7 million and $7.4 million to cost of revenues for amortization of external-use software development costs for the three months ended March 31, 2024 and 2023, respectively.

The estimated future amortization expenses for external-use software development costs were as follows:


	March 31, 2024

	(In thousands)
Remaining nine months of 2024	$	18,813
2025	19,030
2026	13,500
2027	7,546
2028	3,688
Thereafter	963
Total	$	63,540