Investment in Unconsolidated Joint Ventures (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($) property joint_venture	Mar. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of properties	140
Amortization expense, present value of future insurance profits \| $	$ (0.1)	$ 0.1
2001 Sixth Avenue
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures	50.00%
Number of joint ventures \| joint_venture	3
33 Chun Choi Street (Hong Kong)
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures	20.00%
Prudential
Schedule of Equity Method Investments [Line Items]
Number of joint ventures \| joint_venture	2
Number of properties	10
43915 Devin Shafron Drive
Schedule of Equity Method Investments [Line Items]
Number of properties	1

Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Amortization

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- Definition

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+ References

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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