| Intangible Assets, Net Below is a summary of intangible assets, net: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Definite-Lived | | Indefinite-Lived | | Total | | (in thousands) | Gross Book Value | | Accumulated Amortization | | Net Book Value | | Net Book Value | | Net Book Value | | Balances at December 31, 2024 | $ | 809,064 | | | $ | (473,133) | | | $ | 335,931 | | | $ | 42,298 | | | $ | 378,229 | | | | | | | | | | | | | Intangible amortization | — | | | (38,833) | | | (38,833) | | | — | | | (38,833) | | | Balances at September 30, 2025 | $ | 809,064 | | | $ | (511,966) | | | $ | 297,098 | | | $ | 42,298 | | | $ | 339,396 | |
Definite-lived intangible asset amortization for the remainder of fiscal year 2025 and succeeding fiscal years is estimated as follows: | | | | | | | | | | Fiscal Year | | Amount
(in thousands) | | Remainder of 2025 | | 12,944 | | | 2026 | | 50,797 | | | 2027 | | 47,695 | | | 2028 | | 42,033 | | | 2029 | | 36,440 | | | 2030 and thereafter | | 107,189 | | | Total | | $ | 297,098 | |
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