Investment in Unconsolidated Joint Ventures (Terminus Office Holdings LLC) (Details) - Terminus Office Holdings $ in Millions	Dec. 31, 2018 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	$ 7.5
Secured Mortgage Note Payable
Schedule of Equity Method Investments [Line Items]
Number of non-recourse mortgage loans \| debt_instrument	2
Principal amount	$ 198.7
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://fasb.org/us-gaap/role/ref/legacyRef
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