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Fair Value of Financial Instruments (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Level 2 | Accounts payable and accrued expenses | Interest rate swaps    
Fair value of financial assets and liabilities    
Fair value of derivative liabilities $ 473,000  
Level 2 | Other assets, net | Interest rate swaps    
Fair value of financial assets and liabilities    
Fair value of derivative assets 1,700,000  
Mortgages Payable    
Fair value of financial assets and liabilities    
Unamortized balance of non-cash net premiums 5,900,000 $ 6,400,000
Remaining balance of deferred financing costs at period end 236,000 324,000
Notes and bonds payable    
Fair value of financial assets and liabilities    
Unamortized balance of original issuance discounts 14,300,000 19,800,000
Remaining balance of deferred financing costs at period end 34,100,000 20,800,000
Carrying value    
Fair value of financial assets and liabilities    
Notes receivable issued in connection with property sales 5,300,000 5,400,000
Mortgages payable assumed in connection with acquisitions 320,300,000 460,000,000
Notes and bonds payable 5,250,000,000 3,975,000,000
Estimated fair value    
Fair value of financial assets and liabilities    
Notes receivable issued in connection with property sales 5,300,000 5,500,000
Mortgages payable assumed in connection with acquisitions 334,200,000 468,700,000
Notes and bonds payable $ 5,475,300,000 $ 4,143,300,000