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Investments in Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
officeAsset
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Investments in and Advances to Affiliates [Line Items]      
Investment balance   $ 51,021 $ 56,464
NNN Office JV LP      
Investments in and Advances to Affiliates [Line Items]      
Ownership percentage   20.00%  
Investment balance   $ 26,030 31,615
Etna Park 70 LLC      
Investments in and Advances to Affiliates [Line Items]      
Ownership percentage   90.00%  
Investment balance   $ 12,857 12,514
Etna Park East LLC      
Investments in and Advances to Affiliates [Line Items]      
Ownership percentage   90.00%  
Investment balance   $ 7,979 7,484
BSH Lessee L.P.      
Investments in and Advances to Affiliates [Line Items]      
Ownership percentage   25.00%  
Investment balance   $ 4,155 $ 4,851
Mortgages | NNN Office JV LP      
Investments in and Advances to Affiliates [Line Items]      
Non-recourse mortgage loan $ 40,800    
NNN Office Joint Venture Properties | NNN Office JV LP      
Investments in and Advances to Affiliates [Line Items]      
Number of properties sold | officeAsset 2    
Aggregate gain on sale of properties $ 557    
Aggregate gross disposition price $ 8,504