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Available for Sale Debt Securities - Summary of Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]    
Cost $ 204,509 $ 145,647
Unrealized gains 65,891 87,353
Fair Value 270,400 233,000
Available for sale debt securities, current 66,000 69,984
Available for sale debt securities, noncurrent 204,400 163,016
Debt Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 134,068 145,647
Unrealized gains 29,432 68,753
Fair Value 163,500 214,400
Available for sale debt securities, current 66,000 69,984
Available for sale debt securities, noncurrent 97,500 144,416
Series B Preferred Shares    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 70,441  
Unrealized gains 19,759  
Fair Value 90,200  
Available for sale debt securities, current 0  
Available for sale debt securities, noncurrent 90,200  
Forwards    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 0 0
Unrealized gains 12,300 18,600
Fair Value 12,300 18,600
Available for sale debt securities, current 0 0
Available for sale debt securities, noncurrent 12,300 $ 18,600
Development Funding Bond Forward    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 0  
Unrealized gains 4,400  
Fair Value 4,400  
Available for sale debt securities, current 0  
Available for sale debt securities, noncurrent $ 4,400