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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
tenants
Dec. 31, 2014
Revolving Credit Facility | Unsecured Debt    
Loss Contingencies    
Letters of credit outstanding | $ $ 3.3  
Customer Concentration Risk | Sales    
Loss Contingencies    
Percentage of revenue from one industry 16.00% 32.00%
Customer Concentration Risk | Rentable Square Feet    
Loss Contingencies    
Percentage of revenue from one industry 24.80%  
Number of tenants | tenants 15