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Available for Sale Debt Securities - Summary of Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Cost $ 350,000 $ 204,509
Unrealized (Losses)/Gains   65,891
Unrealized (Losses)/Gains (124,900)  
Fair Value 225,100 270,400
Available for sale debt securities, current 1,300 66,000
Available for sale debt securities, noncurrent 226,300 204,400
Available for sale debt securities, liabilities current 0 0
Available for sale debt securities, liabilities noncurrent (2,500) 0
Debt securities    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 359,400 204,509
Unrealized (Losses)/Gains   49,191
Unrealized (Losses)/Gains (131,800)  
Fair Value 227,600 253,700
Available for sale debt securities, current 1,300 66,000
Available for sale debt securities, noncurrent 226,300 187,700
Available for sale debt securities, liabilities current 0 0
Available for sale debt securities, liabilities noncurrent 0 0
Funding Commitments    
Debt and Equity Securities, FV-NI [Line Items]    
Cost (9,400)  
Unrealized (Losses)/Gains 6,900  
Fair Value (2,500)  
Available for sale debt securities, current 0  
Available for sale debt securities, noncurrent  
Available for sale debt securities, liabilities current 0  
Available for sale debt securities, liabilities noncurrent $ (2,500)  
Forwards    
Debt and Equity Securities, FV-NI [Line Items]    
Cost   0
Unrealized (Losses)/Gains   16,700
Fair Value   16,700
Available for sale debt securities, current   0
Available for sale debt securities, noncurrent   16,700
Available for sale debt securities, liabilities current   0
Available for sale debt securities, liabilities noncurrent   $ 0