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Summary of Significant Accounting Policies - Consolidated Entities (Details) - VIE, Primary Beneficiary
6 Months Ended
Mar. 01, 2018
Jun. 30, 2018
1455 Market    
Variable Interest Entity [Line Items]    
Ownership Interest   55.00%
Hill7    
Variable Interest Entity [Line Items]    
Ownership Interest   55.00%
HPP-MAC WSP, LLC    
Variable Interest Entity [Line Items]    
Ownership Interest 75.00% 75.00%