Investment in Unconsolidated Joint Ventures - Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Courvoisier Centre JV, LLC
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 14,100
Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 45,262	$ 39,592
Unconsolidated Properties \| US Airways Building Tenancy in Common (US Airways Building)
Schedule of Equity Method Investments [Line Items]
Company's ownership interest (as a percent)	74.58%
Investment Balance	$ 37,783	38,472
Unconsolidated Properties \| 7000 Central Park JV LLC (7000 Central Park) (1)
Schedule of Equity Method Investments [Line Items]
Company's ownership interest (as a percent)	40.00%
Investment Balance	$ 127	120
Unconsolidated Properties \| Tryon Place, LLC
Schedule of Equity Method Investments [Line Items]
Company's ownership interest (as a percent)	14.80%
Investment Balance	$ 1,000	1,000
Unconsolidated Properties \| Courvoisier Centre JV, LLC
Schedule of Equity Method Investments [Line Items]
Company's ownership interest (as a percent)	20.00%
Investment Balance	$ 6,352	$ 0

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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No definition available.

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