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Commitments and Contingencies - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
tenant
Unsecured Debt | Revolving Credit Facility  
Loss Contingencies  
Letters of credit, amount outstanding | $ $ 2.0
Rentable Square Feet | Customer Concentration Risk  
Loss Contingencies  
Concentration risk (as a percent) 23.20%
Number of tenants (in tenants) | tenant 15
Rentable Square Feet | Customer Concentration Risk | Media And Entertainment Sector  
Loss Contingencies  
Concentration risk (as a percent) 17.20%
Rentable Square Feet | Customer Concentration Risk | Technology Sector  
Loss Contingencies  
Concentration risk (as a percent) 26.40%