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Investment in Unconsolidated Joint Ventures (Details)		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) property	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) property item	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) property item
Investment in Unconsolidated Joint Ventures
Number of unconsolidated joint ventures | item					5		5
Number of properties owned and operated by each unconsolidated joint venture | property			1		1		1
Equity in earnings of unconsolidated joint ventures			$ 347,000	$ 134,000	$ 311,000	$ 397,000
Variable Interest Entities
Payments to acquire interest in joint venture					12,686,000
Investment in unconsolidated joint ventures			11,273,000		11,273,000		$ 4,907,000
Shopko retail stores, Lincoln, Nebraska
Variable Interest Entities
Percentage of equity method investments acquired	50.00%
Payments to acquire interest in joint venture	$ 6,300,000
Retail center located in Manahawkin, New Jersey
Variable Interest Entities
Percentage of equity method investments acquired		50.00%
Payments to acquire interest in joint venture		$ 43,500,000
Debt financed		$ 26,100,000
Annual fixed interest rate (as a percent)		4.00%
Investment in unconsolidated joint ventures			$ 8,808,000		8,808,000
Company share of acquisition expense					$ 400,000

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The percentage of ownership of common stock or equity participation acquired under the equity method of accounting.

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Represents the number of properties owned and operated by each unconsolidated joint venture.

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Contractual interest rate for funds borrowed, under the debt agreement.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

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