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Investments in Partnerships - FDP Loan Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 10, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2019
Jul. 31, 2019
Jan. 31, 2018
Schedule Of Equity Method Investments [Line Items]            
Distribution of financing proceeds from equity method investee   $ 0 $ 8,003      
FDP Loan Agreement            
Schedule Of Equity Method Investments [Line Items]            
Long-term debt         $ 350,000 $ 250,000
Proceeds from (Repayments of) Long-term debt and capital securities       $ 51,000    
Distribution of financing proceeds from equity method investee       $ 25,000    
Debt instrument, maturity date   Jan. 22, 2023        
Debt instrument extension term   1 year        
Debt, variable interest rate   2.50%        
Percentage of full recourse guarantee   50.00%        
Full recourse guarantee amount   $ 50,000        
FDP Loan Agreement | Federal Funds Rate            
Schedule Of Equity Method Investments [Line Items]            
Debt, variable interest rate   0.50%        
FDP Loan Agreement | LIBOR Market Index Rate            
Schedule Of Equity Method Investments [Line Items]            
Debt, variable interest rate   1.00%        
FDP Loan Agreement | LIBOR            
Schedule Of Equity Method Investments [Line Items]            
Debt, variable interest rate   3.50%        
FDP Loan Agreement | Partnership Loan            
Schedule Of Equity Method Investments [Line Items]            
Principal payment $ 100,000          
Outstanding principal $ 301,000 $ 201,000        
Accrued interest percentage   15.00%        
Cash distributions description   50/50 cash distributions to the Company and its joint venture partner