Contingencies (Guarantees) (Details)	3 Months Ended
Mar. 31, 2017 USD ($) extension_option	Dec. 31, 2016 USD ($)
Guarantor Obligations [Line Items]
Obligation recorded to reflect guaranty	$ 412,000	$ 412,000
Total amount outstanding on bonds	$ 16,828,000	21,446,000
West Melbourne I, LLC - Phase I (2)
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 42,697,000
Percentage Guaranteed by the Operating Partnership	20.00%
Maximum Guaranteed Amount	$ 8,539,000
Obligation recorded to reflect guaranty	$ 86,000	86,000
West Melbourne I, LLC - Phase II (2)
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 16,497,000
Percentage Guaranteed by the Operating Partnership	20.00%
Maximum Guaranteed Amount	$ 3,299,000
Obligation recorded to reflect guaranty	$ 33,000	33,000
Port Orange I, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 57,718,000
Percentage Guaranteed by the Operating Partnership	20.00%
Maximum Guaranteed Amount	$ 11,544,000
Obligation recorded to reflect guaranty	$ 116,000	116,000
Ambassador Infrastructure, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	65.00%
Outstanding Balance	$ 11,035,000
Percentage Guaranteed by the Operating Partnership	100.00%
Maximum Guaranteed Amount	$ 11,035,000
Obligation recorded to reflect guaranty	$ 177,000	$ 177,000
Debt instrument, option extension term (in years)	1 year
Number of extension options available \| extension_option	2
West Melbourne I, II and Port Orange I
Guarantor Obligations [Line Items]
Debt instrument, option extension term (in years)	1 year
Ambassador Infrastructure, following any calendar year in which PILOT payments received are $1,200 or more
Guarantor Obligations [Line Items]
Percentage Guaranteed by the Operating Partnership	50.00%
PILOT payment threshold for change in guarantors percentage	$ 1,200,000
Ambassador Infrastructure, following any calendar year in which PILOT payments received are $1,400 or more
Guarantor Obligations [Line Items]
Percentage Guaranteed by the Operating Partnership	20.00%
PILOT payment threshold for change in guarantors percentage	$ 1,400,000
York Town Center, LP
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	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	$ 14,000,000
Reimburse Obligations (as a percent)	50.00%

The annual reduction amount to the Guarantor's Obligations.

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Debt Instrument, Period of Extension Option

+ References

No definition available.

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- Definition

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

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No definition available.

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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.

+ References

No definition available.

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Represents amount recoverable by guarantor from third parties for amounts paid under the guaranty.

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No definition available.

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- Definition

Percentage of third party construction loan guaranteed by the company.

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No definition available.

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

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Number of extension options available.

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No definition available.

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PILOT Payment Threshold for Change in Guarantors Percentage

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No definition available.

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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.

+ References

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-Name Accounting Standards Codification
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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.

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No definition available.

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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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