Mortgages Payable - Summary (Details) - USD ($) $ in Thousands			6 Months Ended
Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2018
Debt Instrument [Line Items]
Fixed rate mortgages payable	$ 1,550,420		$ 1,550,420
Weighted average interest rate (as a percent)	3.93%		3.93%
Fixed rate debt
Debt Instrument [Line Items]
Fixed rate mortgages payable	$ 1,424,420		$ 1,424,420
Weighted average interest rate (as a percent)	4.00%		4.00%
Mortgages payable
Debt Instrument [Line Items]
Premium, net of accumulated amortization	$ 900	$ 1,024	$ 900
Discount, net of accumulated amortization	(558)	(579)	(558)
Capitalized loan fees, net of accumulated amortization	(495)	(615)	(495)
Mortgages payable, net	274,267	287,068	274,267
Amount of mortgages payable repaid			10,750
Scheduled principal payments related to amortizing loans			2,068
Mortgages payable \| Fixed rate debt
Debt Instrument [Line Items]
Fixed rate mortgages payable	$ 274,420	$ 287,238	$ 274,420
Weighted average interest rate (as a percent)	5.00%	4.99%	5.00%
Weighted average years to maturity	4 years 7 months	5 years 2 months 15 days
Minimum \| Mortgages payable
Debt Instrument [Line Items]
Fixed interest rate (as a percent)	3.75%	3.75%	3.75%
Maximum \| Mortgages payable
Debt Instrument [Line Items]
Fixed interest rate (as a percent)	8.00%	8.00%	8.00%
Debt repaid or defeased \| Mortgages payable
Debt Instrument [Line Items]
Fixed interest rate (as a percent)	4.82%		4.82%

Represents the weighted average maturity period for the debt instrument.

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

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- Definition

Amount, after accumulated amortization, of debt premium.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

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