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Contingencies - Guarantees (Details)	9 Months Ended
	Sep. 30, 2018 USD ($) extension_option	Dec. 31, 2017 USD ($)
Guarantor Obligations [Line Items]
Obligation Recorded to Reflect Guaranty	$ 1,166,000	$ 841,000
Total amount outstanding on bonds	$ 17,309,000	16,998,000
West Melbourne I, LLC - Phase I
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 41,737,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 20,869,000
Obligation Recorded to Reflect Guaranty	$ 209,000	86,000
West Melbourne I, LLC - Phase II
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 16,097,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 8,049,000
Obligation Recorded to Reflect Guaranty	$ 80,000	33,000
Port Orange I, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 56,366,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 28,183,000
Obligation Recorded to Reflect Guaranty	$ 282,000	116,000
Ambassador Infrastructure, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	65.00%
Outstanding Balance	$ 10,605,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 10,605,000
Obligation Recorded to Reflect Guaranty	$ 106,000	177,000
Shoppes at Eagle Point, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 32,679,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 36,400,000
Obligation Recorded to Reflect Guaranty	$ 364,000	364,000
Reduction of guarantor obligations once construction is complete (as a percent)	35.00%
Number of extension options available | extension_option	1
Option extension term of debt instrument	2 years
EastGate Storage, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 4,162,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 6,500,000
Obligation Recorded to Reflect Guaranty	$ 65,000	65,000
Reduction of guarantor obligations once construction is complete (as a percent)	50.00%
Reduction of guarantor obligations once certain debt and operational metrics are met (as a percent)	25.00%
Self Storage at Mid Rivers, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 2,021,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 5,987,000
Obligation Recorded to Reflect Guaranty	$ 60,000	$ 0
Reduction of guarantor obligations once construction is complete (as a percent)	50.00%
Reduction of guarantor obligations once certain debt and operational metrics are met (as a percent)	25.00%
Guaranty fee (as a percent)	1.00%
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	$ 13,200,000
Reimburse obligations (as a percent)	50.00%

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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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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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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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