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Debt (Australia - Ravenhall) (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
AUD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
AUD ($)
Dec. 31, 2019
USD ($)
May 22, 2019
USD ($)
May 22, 2019
AUD ($)
Debt Instrument [Line Items]              
Payments on long-term debt $ 125,505,000   $ 96,926,000        
Gain (loss) on extinguishment of debt $ 1,563,000   $ 0        
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%      
Non Recourse Debt              
Debt Instrument [Line Items]              
Debt issuance costs, net $ 4,549,000       $ 5,279,000    
Notes Payable, Other Payables              
Debt Instrument [Line Items]              
Long-term debt 44,300,000            
Debt issuance costs, net 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 $ 190,400,000 $ 310,000,000          
Ravenhall | Non Recourse Debt | Non Recourse Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount           $ 283,500,000 $ 462,000,000
Stated interest rate 4.23%     4.23%      
Ravenhall | National Australia Bank Limited | Non Recourse Debt | Construction Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 485,800,000     $ 791,000,000      
Debt instrument basis spread on variable rate 2.00% 2.00%