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Debt (Australia - Ravenhall) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
AUD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
AUD ($)
Dec. 31, 2019
USD ($)
May 22, 2019
USD ($)
May 22, 2019
AUD ($)
Debt Instrument [Line Items]                  
Payments on long-term debt     $ 380,055,000   $ 310,616,000        
Gain (loss) on extinguishment of debt $ 1,472,000 $ 594,000 $ 3,035,000   $ (5,147,000)        
LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument basis spread on variable rate     2.00% 2.00%          
Interest Rate Swap                  
Debt Instrument [Line Items]                  
Derivative, fixed interest rate 4.22%   4.22%     4.22%      
Non Recourse Debt                  
Debt Instrument [Line Items]                  
Debt issuance costs, net $ 4,984,000   $ 4,984,000       $ 5,279,000    
Notes Payable, Other Payables                  
Debt Instrument [Line Items]                  
Long-term debt 44,300,000   44,300,000            
Debt issuance costs, net $ 700,000   700,000            
Ravenhall | Non Recourse Debt                  
Debt Instrument [Line Items]                  
Gain (loss) on extinguishment of debt     (4,500,000)            
Ravenhall | Non Recourse Debt | Construction Facility                  
Debt Instrument [Line Items]                  
Payments on long-term debt     $ 221,400,000 $ 310,000,000          
Ravenhall | Non Recourse Debt | Non Recourse Notes                  
Debt Instrument [Line Items]                  
Debt instrument, face amount               $ 329,900,000 $ 462,000,000
Stated interest rate 4.23%   4.23%     4.23%      
Ravenhall | National Australia Bank Limited | Non Recourse Debt | Construction Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 564,900,000   $ 564,900,000     $ 791,000,000      
Debt instrument basis spread on variable rate     2.00% 2.00%