Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details)
May 25, 2017
USD ($)
Jun. 30, 2018
USD ($)
Property
Dec. 31, 2017
USD ($)
Aug. 31, 2010
USD ($)
Capital Leases        
Capital lease term 99 years      
Purchase option $ 1      
Capital lease obligation $ 16,100,000 $ 640,000 $ 15,853,000  
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        
Capital Leases        
Purchase obligations   89,400,000    
Capital Expenditures For Operating Properties        
Capital Leases        
Purchase obligations   41,500,000    
Third Party Construction        
Capital Leases        
Purchase obligations   4,500,000    
Other Obligations        
Capital Leases        
Purchase obligations   $ 2,400,000    
Specialty Tax Guarantee | Anne Arundel County, Maryland | Tax Incremental Financing Bond        
Loss Contingencies [Line Items]        
Loan amount       $ 30,000,000