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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - MCB Real Estate, LLC (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2016 USD ($) item	Sep. 30, 2015	Dec. 31, 2015 USD ($)
Consolidated VIEs Carrying Amount of Assets and Liabilities
Owner/Operator mortgage from third party		$ 396,676,000		$ 331,055,000
Net book value of property		2,651,000
Impairment charge		$ 0
Consolidated JV
Consolidated VIEs Carrying Amount of Assets and Liabilities
Number of joint ventures with controlling interest | item		6
MCB Real Estate LLC And Its Affiliates | Consolidated JV
Consolidated VIEs Carrying Amount of Assets and Liabilities
Number of joint ventures with controlling interest | item		5
Investment in consolidated joint ventures		$ 10,313,000
MCB Real Estate LLC And Its Affiliates | Consolidated JV | Pathmark supermarket in Philadelphia, Pennsylvania
Consolidated VIEs Carrying Amount of Assets and Liabilities
Investment in consolidated joint ventures		2,768,000
Percentage of rental income	1.30%		1.30%
Owner/Operator mortgage from third party		4,426,000
Net book value of property		7,205,000
Impairment charge		$ 0

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Represents the number of joint ventures in which entity has controlling interest.

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Represent the percentage of the company's rental income accounted by the tenant.

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

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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The book value of investments in real estate joint ventures including direct and indirect investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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