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Notes Payable and Unsecured Credit Facilities Schedule of maturities of long-term debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$ 4,924
Long-term Debt, Maturities, Repayments of Principal in Year Two	350,361
Long-term Debt, Maturities, Repayments of Principal in Year Three	87,850
Long-term Debt, Maturities, Repayments of Principal in Year Four	702,646
Long-term Debt, Maturities, Repayments of Principal in Year Five	69,452
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,486,859
Debt Instrument, Unamortized Discount (Premium), Net	(23,627)
Total	3,678,465	$ 3,715,212
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total	2,522,514	$ 2,475,322
Scheduled Principal Payments [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	4,924
Long-term Debt, Maturities, Repayments of Principal in Year Two	11,287
Long-term Debt, Maturities, Repayments of Principal in Year Three	11,599
Long-term Debt, Maturities, Repayments of Principal in Year Four	11,798
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	76,698
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	76,251
Long-term Debt, Maturities, Repayments of Principal in Year Four	5,848
Long-term Debt, Maturities, Repayments of Principal in Year Five	59,375
Long-term Debt, Maturities, Repayments of Principal after Year Five	209,846
Debt Instrument, Unamortized Discount (Premium), Net	4,890
Total	395,284
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	300,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	685,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,250,000
Debt Instrument, Unamortized Discount (Premium), Net	(28,517)
Total	$ 3,206,483

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