Investment in Unconsolidated Joint Ventures (Terminus Office Holdings LLC) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) Property	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	$ 133,884	$ 161,907
Terminus Office Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	5000.00%
Value of interest in the property	$ 148,000
Investment in unconsolidated joint ventures	503,000
Gain recorded in income from unconsolidated joint ventures	$ 92,800
Terminus Office Holdings LLC \| Secured Mortgage Note Payable
Schedule of Equity Method Investments [Line Items]
Weighted average interest rate	50.00%
Terminus Office Holdings LLC \| Office Buildings
Schedule of Equity Method Investments [Line Items]
Number of properties owned \| Property	2
Terminus Office Holdings LLC \| JPM
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	5000.00%

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