Mortgages Payable - Debt Maturities (Details) $ in Thousands	Jun. 30, 2018 USD ($) instrument	Dec. 31, 2017 USD ($)
Long-term Debt, Fiscal Year Maturity
2018	$ 2,098
2019	25,257
2020	3,923
2021	372,820
2022	283,216
Thereafter	863,106
Total	$ 1,550,420
Long-term Debt, Weighted Average Interest Rate
2018	5.09%
2019	7.29%
2020	4.62%
2021	3.56%
2022	4.17%
Thereafter	3.91%
Total	3.93%
Mortgages payable
Debt Instrument [Line Items]
Premium, net of accumulated amortization	$ 900	$ 1,024
Discount, net of accumulated amortization	(558)	(579)
Capitalized loan fees, net of accumulated amortization	(495)	(615)
Unsecured notes payable
Debt Instrument [Line Items]
Discount, net of accumulated amortization	(793)	(853)
Capitalized loan fees, net of accumulated amortization	$ (3,152)	$ (3,399)
Consolidated indebtedness
Debt Instrument [Line Items]
Weighted average years to maturity	5 years 3 months
Capitalized loan fees, net of accumulated amortization	$ (6,064)
Fixed rate debt
Long-term Debt, Fiscal Year Maturity
2018	2,098
2019	25,257
2020	3,923
2021	372,820
2022	157,216
Thereafter	863,106
Total	$ 1,424,420
Long-term Debt, Weighted Average Interest Rate
2018	5.09%
2019	7.29%
2020	4.62%
2021	3.56%
2022	5.00%
Thereafter	3.91%
Total	4.00%
Fixed rate debt \| Mortgages payable
Debt Instrument [Line Items]
Weighted average years to maturity	4 years 7 months	5 years 2 months 15 days
Long-term Debt, Fiscal Year Maturity
2018	$ 2,098
2019	25,257
2020	3,923
2021	22,820
2022	157,216
Thereafter	63,106
Total	$ 274,420	$ 287,238
Long-term Debt, Weighted Average Interest Rate
Total	5.00%	4.99%
Fixed rate debt \| Unsecured term loans
Long-term Debt, Fiscal Year Maturity
2018	$ 0
2019	0
2020	0
2021	250,000
2022	0
Thereafter	200,000
Total	450,000
Fixed rate debt \| Unsecured notes payable
Long-term Debt, Fiscal Year Maturity
2018	0
2019	0
2020	0
2021	100,000
2022	0
Thereafter	600,000
Total	$ 700,000
Variable rate debt
Long-term Debt, Weighted Average Interest Rate
2018	0.00%
2019	0.00%
2020	0.00%
2021	0.00%
2022	3.14%
Thereafter	0.00%
Total	3.14%
Variable rate debt \| Revolving line of credit
Long-term Debt, Fiscal Year Maturity
2018	$ 0
2019	0
2020	0
2021	0
2022	126,000
Thereafter	0
Total	126,000
Two $100,00 and one $50,000 interest rate swaps maturing in 2021
Debt Instrument [Line Items]
Variable rate debt swapped to fixed rate	$ 250,000
Number of instruments \| instrument	3
Fixed interest rate (as a percent)	2.00%
Two $100,000 interest rate swaps maturing in 2018
Debt Instrument [Line Items]
Variable rate debt swapped to fixed rate	$ 200,000
Number of instruments \| instrument	2
Fixed interest rate (as a percent)	1.26%
LIBOR \| Two $100,00 and one $50,000 interest rate swaps maturing in 2021
Debt Instrument [Line Items]
Reference rate for variable interest rate	one-month floating rate LIBOR
LIBOR \| Two $100,000 interest rate swaps maturing in 2018
Debt Instrument [Line Items]
Reference rate for variable interest rate	one-month floating rate LIBOR

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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