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Investment in Unconsolidated Joint Ventures (Additional Information) (Details) - USD ($)
$ in Thousands
Oct. 01, 2019
Sep. 30, 2019
Dec. 31, 2018
Investment [Line Items]      
Investment value   $ 186,079 $ 161,907
Subsequent Event | Terminus Office Holdings LLC      
Investment [Line Items]      
Net purchase price $ 148,000    
Investment value 503,000    
Gain from purchase of partner's interest $ 94,000