The cost and accumulated amortization of intangible assets as of June 30, 2025 and December 31, 2024 are as follows:


	June 30, 2025
	Weighted average useful life	Gross carrying amount		Accumulated amortization		Net carrying amount

		in thousands
Internally developed software	3.4	$	144,579	$	(92,928)	$	51,651
Renewal rights	9.9	19,631		(9,658)		9,973
Trade names and trademarks	14.2	11,867		(3,824)		8,043
State licenses (1)	Indefinite	11,263		—		11,263
Relationships and customer lists	15.5	7,914		(2,119)		5,795
Other	3.6	620		(613)		7
Total intangible assets		$	195,874	$	(109,142)	$	86,732

(1) Represents approved state licenses related to the acquisition of Drivers Edge. Refer to Note 10 — Acquisition for additional details.


	December 31, 2024
	Weighted average useful life	Gross carrying amount		Accumulated amortization		Net carrying amount

		in thousands
Internally developed software	3.3	$	136,235	$	(82,903)	$	53,332
Renewal rights	9.9	19,187		(8,458)		10,729
Trade names and trademarks	14.1	12,061		(3,393)		8,668
State licenses (1)	Indefinite	11,263		—		11,263
Relationships and customer lists	15.4	7,975		(1,896)		6,079
Other	4.2	1,065		(1,029)		36
Total intangible assets		$	187,786	$	(97,679)	$	90,107

(1) Represents approved state licenses related to the acquisition of Drivers Edge. Refer to Note 10 — Acquisition for additional details.

Intangible asset amortization expense was $5.8 million and $6.9 million for the three months ended June 30, 2025 and 2024, respectively, and $12.2 million and $14.3 million for the six months ended June 30, 2025 and 2024, respectively.

Estimated future aggregate amortization expense related to intangible assets as of June 30, 2025 is as follows:


	in thousands
2025 - remaining	$	11,908
2026	20,779
2027	17,309
2028	11,037
2029	4,905
Thereafter	9,531
Total	$	75,469