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, 2016
USD ($)
Property
Aug. 31, 2010
USD ($)
Tax incremental financing obligation    
Liability recognized with regard to tax incremental financing obligation at end of current period $ 1,300,000  
Environmental Indemnity Agreement    
Number of properties which were provided environmental indemnifications | Property 3  
Maximum additional costs agreed to be paid by the entity under environmental indemnification agreement $ 19,000,000  
New Development and Redevelopment Obligations    
Loss Contingencies [Line Items]    
Purchase obligations 77,600,000  
Capital Expenditures For Operating Properties    
Loss Contingencies [Line Items]    
Purchase obligations 60,500,000  
Third Party Construction and Development    
Loss Contingencies [Line Items]    
Purchase obligations 10,500,000  
Other Purchase Obligations    
Loss Contingencies [Line Items]    
Purchase obligations $ 1,800,000  
Anne Arundel County, Maryland | Tax Incremental Financing Bond    
Tax incremental financing obligation    
Debt instrument, face amount   $ 30,000,000