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Debt (Australia - Ravenhall) (Details) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 AUD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 AUD ($) | Dec. 31, 2019 USD ($) | May 22, 2019 USD ($) | May 22, 2019 AUD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on long-term debt |  |  | $ 262,411,000 |  | $ 213,926,000 |  |  |  |
Gain (loss) on extinguishment of debt | $ 0 | $ (5,741,000) | $ 1,563,000 |  | $ (5,741,000) |  |  |  |
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 | $ 4,953,000 |  | $ 4,953,000 |  |  |  | $ 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 |  |  | $ 213,200,000 | $ 310,000,000 |  |  |  |  |
Ravenhall | Non Recourse Debt | Non Recourse Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 317,700,000 | $ 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 | $ 544,000,000.0 |  | $ 544,000,000.0 |  |  | $ 791,000,000 |  |  |
Debt instrument basis spread on variable rate |  |  | 2.00% | 2.00% |  |  |  |  |

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