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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]  
Debt Securities, Available-for-Sale, Allowance for Credit Loss A reconciliation of provision for credit losses for each of the periods presented herein is presented below:
 
     Year Ended
March 31,		      Three Months Ended
March 31,		      Year Ended
December 31,		  
(in thousands)
    2023      2022      2021      2021      2020  
                  
(unaudited)
                
OTTI on AFS debt securities (Note 5)
    $ 12,621    $ 4,943    $ —      $ 13,726    $ —  
Bad debt expense on related party receivable (Note 9)
      6,723      4,440      —          5,029      —    
Bad debt expense on other receivables
      1,236      —          —          —          —    
  
 
 
     
 
 
     
 
 
     
 
 
     
 
 
  
Provision for credit losses
    $ 20,580    $ 9,383    $ —      $ 18,755    $ —