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Available for Sale Debt Securities - Summary of Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Cost $ 269,359 $ 204,509
Unrealized Gains 113,641 65,891
Fair Value 383,000 270,400
Available for sale debt securities, current 363,700 66,000
Available for sale debt securities, noncurrent 63,000 204,400
Available for sale debt securities, liabilities current 0 0
Available for sale debt securities, liabilities noncurrent (43,700) 0
Debt securities    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 278,759 204,509
Unrealized Gains 84,241 49,191
Fair Value 363,000 253,700
Available for sale debt securities, current 300,000 66,000
Available for sale debt securities, noncurrent 63,000 187,700
Available for sale debt securities, liabilities current 0 0
Available for sale debt securities, liabilities noncurrent 0 0
Forwards    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 0 0
Unrealized Gains 28,100 16,700
Fair Value 28,100 16,700
Available for sale debt securities, current 63,700 0
Available for sale debt securities, noncurrent 0 16,700
Available for sale debt securities, liabilities current 0 0
Available for sale debt securities, liabilities noncurrent (35,600) $ 0
Funding Commitments    
Debt and Equity Securities, FV-NI [Line Items]    
Cost (9,400)  
Unrealized Gains 1,300  
Fair Value (8,100)  
Available for sale debt securities, current 0  
Available for sale debt securities, noncurrent 0  
Available for sale debt securities, liabilities current 0  
Available for sale debt securities, liabilities noncurrent $ (8,100)