Intangible assets, net consisted of the following as of June 30, 2025 and December 31, 2024 (in thousands):


	June 30, 2025		December 31, 2024
Intangible assets, at cost:
Saltwater disposal easement	$	17,557	$	17,557
Contracts acquired in a business combination	15,700		15,700
Groundwater rights acquired	3,846		3,846
Total intangible assets, at cost (1)	37,103		37,103
Less: accumulated amortization	(3,086)		(1,915)
Intangible assets, net	$	34,017	$	35,188

(1)The remaining weighted average amortization period for total intangible assets was 10.8 years as of June 30, 2025.

Amortization of intangible assets was $0.6 million and $0.3 million for the three months ended June 30, 2025 and 2024, respectively. Amortization of intangible assets was $1.2 million and $0.6 million for the six months ended June 30, 2025 and 2024, respectively. The estimated future amortization expense of intangible assets for each of the next five years and thereafter is as follows (in thousands):


Year	Estimated Future Amortization Expense
Remainder of 2025	$	1,171
2026	2,342
2027	2,342
2028	2,342
2029	2,342
2030 and thereafter	23,478
Total expected amortization expense	$	34,017