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Debt - Construction Loan (Details) - Construction Loan Payable - USD ($)
1 Months Ended
Oct. 23, 2017
Dec. 31, 2018
Debt Instrument [Line Items]    
Non-recourse construction loan   $ 200,000,000
Borrowings outstanding   $ 63,000,000
LIBOR    
Debt Instrument [Line Items]    
Interest rate 2.70%