Investment in Unconsolidated Joint Ventures (Terminus Office Holdings LLC) (Details) - Terminus Office Holdings $ in Thousands	Dec. 31, 2017 USD ($) property debt_instrument
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%
Cash balance of joint venture	$ 7,400
Secured Mortgage Note Payable
Schedule of Equity Method Investments [Line Items]
Number of non-recourse mortgage loans \| debt_instrument	2
Principal amount	$ 203,131
Weighted average interest rate	4.68%
Office Buildings
Schedule of Equity Method Investments [Line Items]
Number of properties owned \| property	2
JPM
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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