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Contingencies (Guarantees) (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) extension_option	Dec. 31, 2017 USD ($)
Guarantor Obligations [Line Items]
Obligation recorded to reflect guaranty	$ 841,000	$ 841,000
Total amount outstanding on bonds	$ 15,787,000	16,998,000
West Melbourne I, LLC - Phase I
Guarantor Obligations [Line Items]
Company's Ownership Interest	50.00%
Outstanding Balance	$ 42,097,000
Percentage Guaranteed by the Operating Partnership	20.00%
Maximum Guaranteed Amount	$ 8,419,000
Obligation recorded to reflect guaranty	$ 86,000	86,000
West Melbourne I, LLC - Phase II
Guarantor Obligations [Line Items]
Company's Ownership Interest	50.00%
Outstanding Balance	$ 16,257,000
Percentage Guaranteed by the Operating Partnership	20.00%
Maximum Guaranteed Amount	$ 3,251,000
Obligation recorded to reflect guaranty	$ 33,000	33,000
Port Orange I, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest	50.00%
Outstanding Balance	$ 56,878,000
Percentage Guaranteed by the Operating Partnership	20.00%
Maximum Guaranteed Amount	$ 11,376,000
Obligation recorded to reflect guaranty	$ 116,000	116,000
Ambassador Infrastructure, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest	65.00%
Outstanding Balance	$ 10,605,000
Percentage Guaranteed by the Operating Partnership	100.00%
Maximum Guaranteed Amount	$ 10,605,000
Obligation recorded to reflect guaranty	$ 177,000	177,000
Shoppes at Eagle Point, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest	50.00%
Outstanding Balance	$ 9,399,000
Percentage Guaranteed by the Operating Partnership	100.00%
Maximum Guaranteed Amount	$ 36,400,000
Obligation recorded to reflect guaranty	$ 364,000	364,000
Guarantor obligations, guaranty reduction, percentage, once construction is complete	35.00%
Number of extension options available (extension option) | extension_option	1
Debt instrument, option extension term	2 years
EastGate Storage, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest	50.00%
Outstanding Balance	$ 93,000
Percentage Guaranteed by the Operating Partnership	100.00%
Maximum Guaranteed Amount	$ 6,500,000
Obligation recorded to reflect guaranty	$ 65,000	$ 65,000
Guarantor obligations, guaranty reduction, percentage, once construction is complete	50.00%
Guarantor obligations, guaranty reduction percentage, once certain debt and operational metrics are met	25.00%
York Town Center, LP
Guarantor Obligations [Line Items]
Company's Ownership Interest	50.00%
Maximum guaranteed amount of YTC's performance	$ 22,000,000
Annual reductions to guarantors obligations	800,000
Guaranteed minimum exposure amount	10,000,000
Maximum guaranteed obligation	$ 13,200,000
Reimburse Obligations	50.00%

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- Definition

The annual reduction amount to the Guarantor's Obligations.

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Portion of the loan amount guaranteed by the company based on the guaranty percentage.

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Minimum potential amount of future payments (undiscounted) the company could be required to make under the guarantee or each group of similar guarantees after reductions.

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Guarantor Obligations, Guaranty Reduction Percentage, Once Certain Debt and Operational Metrics Are Met

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Guarantor Obligations, Guaranty Reduction, Percentage, Once Construction Is Complete

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Percentage of third party construction loan guaranteed by the company.

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Company's maximum guaranteed amount after loans were partially paid down.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

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This element represents the current and noncurrent portions of a long-term real estate loan with an initial maturity beyond one year or beyond the normal operating cycle, if longer, to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project (generally one to seven years), usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property.

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Amount of letters of credit and other surety bonds that are available for the future payment of malpractice claims.

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