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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Consolidated Joint Ventures (Details)	6 Months Ended
	Jun. 30, 2016 USD ($) item	Jun. 30, 2014
Consolidated JV
Variable Interest Entities
Number of joint ventures with controlling interest | item	6
Industrial building, Joppa, Maryland
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)		95.00%
Preferred interest | $	$ 6,280,000
Accrued interest | $	$ 455,000
Consolidated VIE entities | Consolidated JV
Variable Interest Entities
Number of joint ventures with controlling interest | item	7
Minimum | Consolidated JV
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)	85.00%
Maximum | Consolidated JV
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)	95.00%

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- Definition

Represents the amount of accrued interest included in the preferred interest.

+ References

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- Definition

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

+ References

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- Definition

Represents the amount of repayment made towards the preferred interest, out of the mortgage proceeds received by the company.

+ References

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+ Details

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

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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