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Notes Payable and Unsecured Credit Facilities Schedule of maturities of long-term debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year $ 2,530  
Long-term Debt, Maturities, Repayments of Principal in Year Two 50,359  
Long-term Debt, Maturities, Repayments of Principal in Year Three 86,349  
Long-term Debt, Maturities, Repayments of Principal in Year Four 767,645  
Long-term Debt, Maturities, Repayments of Principal in Year Five 69,451  
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,938,059  
Debt Instrument, Unamortized Discount (Premium), Net (27,125)  
Total 3,887,268 $ 3,715,212
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Total 2,944,076 $ 2,475,322
Scheduled Principal Payments [Member] | Mortgages [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2,530  
Long-term Debt, Maturities, Repayments of Principal in Year Two 11,285  
Long-term Debt, Maturities, Repayments of Principal in Year Three 11,598  
Long-term Debt, Maturities, Repayments of Principal in Year Four 11,797  
Long-term Debt, Maturities, Repayments of Principal in Year Five 10,077  
Long-term Debt, Maturities, Repayments of Principal after Year Five 27,013  
Debt Instrument, Unamortized Discount (Premium), Net 0  
Total 74,300  
Mortgages [Member] | Mortgages [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 0  
Long-term Debt, Maturities, Repayments of Principal in Year Two 39,074  
Long-term Debt, Maturities, Repayments of Principal in Year Three 74,751  
Long-term Debt, Maturities, Repayments of Principal in Year Four 5,848  
Long-term Debt, Maturities, Repayments of Principal in Year Five 59,374  
Long-term Debt, Maturities, Repayments of Principal after Year Five 236,046  
Debt Instrument, Unamortized Discount (Premium), Net 4,490  
Total 419,583  
Unsecured Debt [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 0  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 750,000  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,675,000  
Debt Instrument, Unamortized Discount (Premium), Net (31,615)  
Total $ 3,393,385