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Cumulative Allowance and the Provision for Changes in Expected Cash Flows from Financial Royalty Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ (3,397,481)  
Increases to the cumulative allowance for changes in expected cash flows from financial royalty assets (96,221)  
Decreases to the cumulative allowance for changes in expected cash flows from financial royalty assets 286,656  
Write-off of cumulative allowance 478,777  
Current period provision for credit losses, net 7,050  
Ending balance (2,721,219) $ (3,397,481)
Writeoff related to financial royalty asset   $ 212,000
Tazverik    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Writeoff related to financial royalty asset $ 548,300