Quarterly report pursuant to Section 13 or 15(d)

Debt - (Construction Loan) (Details)

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Debt - (Construction Loan) (Details) - Construction Loan
3 Months Ended
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Debt, face amount $ 200,000,000
Optional extension term 1 year
Borrowings outstanding $ 0
LIBOR  
Debt Instrument [Line Items]  
Interest rate 2.70%