The carrying amounts of external-use software development costs as of June 30, 2024 and December 31, 2023 were as follows:


	June 30, 2024		December 31, 2023

	(In thousands)
Gross carrying amount	$	240,466	$	239,038
Accumulated amortization	(179,613)		(172,379)
External-use software development costs, net (1)	$	60,853	$	66,659

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

The Company recorded $6.4 million and $7.4 million to cost of revenues for amortization of external-use software development costs for the three months ended June 30, 2024 and 2023, respectively, and $13.1 million and $14.8 million for the six months ended June 30, 2024 and 2023, respectively.

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


	June 30, 2024

	(In thousands)
Remaining six months of 2024	$	11,975
2025	19,772
2026	14,331
2027	8,398
2028	4,541
Thereafter	1,836
Total	$	60,853