The cost and accumulated amortization of intangible assets as of June 30, 2026 and December 31, 2025 are as follows:


	June 30, 2026
	Weighted average useful life	Gross carrying amount		Accumulated amortization		Net carrying amount

		dollars in thousands
Internally developed software	3.4	$	166,260	$	(110,158)	$	56,102
Renewal rights	10.0	21,374		(11,575)		9,799
Trade names and trademarks	14.2	11,867		(4,979)		6,888
State licenses	Indefinite	11,263		—		11,263
Relationships and customer lists	15.5	7,900		(2,637)		5,263
Other	3.5	577		(577)		—
Total intangible assets		$	219,241	$	(129,926)	$	89,315


	December 31, 2025
	Weighted average useful life	Gross carrying amount		Accumulated amortization		Net carrying amount

		dollars in thousands
Internally developed software	3.4	$	155,933	$	(102,326)	$	53,607
Renewal rights	10.0	21,740		(10,693)		11,047
Trade names and trademarks	14.2	11,867		(4,402)		7,465
State licenses	Indefinite	11,263		—		11,263
Relationships and customer lists	15.5	7,913		(2,380)		5,533
Other	3.5	580		(580)		—
Total intangible assets		$	209,296	$	(120,381)	$	88,915

Intangible asset amortization expense was $5.7 million and $5.8 million for the three months ended June 30, 2026 and 2025, respectively, and $11.3 million and $12.2 million for the six months ended June 30, 2026 and 2025, respectively.

Estimated future aggregate amortization expense related to intangible assets as of June 30, 2026 is as follows:


	in thousands
2026 - remaining	$	12,682
2027	24,726
2028	19,232
2029	9,558
2030	2,952
Thereafter	8,902
Total	$	78,052