Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details)
Sep. 30, 2015
USD ($)
Property
Aug. 31, 2010
USD ($)
Tax incremental financing obligation    
Liability recognized with regard to tax incremental financing obligation at end of current period $ 2,200,000  
Environmental Indemnity Agreement    
Number of lease properties which were provided environmental indemnifications | Property 3  
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement $ 5,000,000.0  
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property $ 12,500,000.0  
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent) 50.00%  
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities $ 300,000  
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities 1,500,000.0  
New Development and Redevelopment Obligations    
Loss Contingencies [Line Items]    
Purchase obligations 97,900,000  
Capital Expenditures For Operating Properties    
Loss Contingencies [Line Items]    
Purchase obligations 41,900,000  
Third Party Construction and Development    
Loss Contingencies [Line Items]    
Purchase obligations 8,100,000  
Other Purchase Obligations    
Loss Contingencies [Line Items]    
Purchase obligations $ 4,000,000  
Anne Arundel County, Maryland | Tax Incremental Financing Bond    
Tax incremental financing obligation    
Debt instrument, face amount   $ 30,000,000