Fair Value of Financial Instruments (Details) - USD ($)	Mar. 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 interest rate swaps	$ 1,000,000
Level 2 | Other assets, net | Interest rate swaps
Fair value of financial assets and liabilities
Fair value of interest rate swaps	210,000
Carrying value per balance sheet
Fair value of financial assets and liabilities
Notes receivable issued in connection with property sales	5,400,000	$ 5,400,000
Mortgages payable assumed in connection with acquisitions, net	463,300,000	466,000,000
Notes and bonds payable, net	4,641,100,000	3,934,400,000
Estimated fair value
Fair value of financial assets and liabilities
Notes receivable issued in connection with property sales	5,500,000	5,500,000
Mortgages payable assumed in connection with acquisitions, net	465,900,000	468,700,000
Notes and bonds payable, net	$ 4,845,800,000	$ 4,143,300,000