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Debt (Australia - Ravenhall) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 AUD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 AUD ($)	Dec. 31, 2020 USD ($)	May 22, 2019 USD ($)	May 22, 2019 AUD ($)
Debt Instrument [Line Items]
Payments on long-term debt			$ 356,831,000		$ 262,411,000
Gain (loss) on extinguishment of debt	$ 1,654,000	$ 0	$ 4,693,000		$ 1,563,000
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	$ 4,945,000		$ 4,945,000				$ 5,237,000
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)
Debt issuance costs, gross	$ 7,500,000		7,500,000
Ravenhall | Non Recourse Debt | Construction Facility
Debt Instrument [Line Items]
Payments on long-term debt			$ 232,700,000	$ 310,000,000
Ravenhall | Non Recourse Debt | Non Recourse Notes
Debt Instrument [Line Items]
Debt instrument, face amount								$ 346,600,000	$ 461,600,000
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	$ 593,900,000		$ 593,900,000			$ 791,000,000
Debt instrument basis spread on variable rate			2.00%	2.00%

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