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Investments in Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Feb. 28, 2019
USD ($)
Dec. 31, 2018
USD ($)
a
Sep. 30, 2020
USD ($)
partnership
officeAsset
Sep. 30, 2019
USD ($)
officeAsset
Dec. 31, 2019
USD ($)
a
Dec. 31, 2017
a
Investments in and Advances to Affiliates [Line Items]            
Investment balance     $ 56,489   $ 57,168  
Number of joint venture interests | partnership     1      
Non-consolidated Real Estate Entity            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage 15.00%          
NNN Office JV LP            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage     20.00%      
Investment balance     $ 32,723   39,288  
Etna Park 70 LLC            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage     90.00%      
Investment balance     $ 11,352   8,352  
Area of land (in acres) | a   57       151
Payments to acquire interest in joint venture   $ 3,008        
Etna Park East LLC            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage     90.00%      
Investment balance     $ 7,391   $ 4,310  
Area of land (in acres) | a         129.6  
Other Joint Ventures            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage     25.00%      
Investment balance     $ 5,023   $ 5,218  
Mortgages | NNN Office JV LP            
Investments in and Advances to Affiliates [Line Items]            
Non-recourse mortgage loan     $ 40,800 $ 101,520    
NNN Office Joint Venture Properties            
Investments in and Advances to Affiliates [Line Items]            
Aggregate gain on sale of properties $ 824          
NNN Office Joint Venture Properties | NNN Office JV LP            
Investments in and Advances to Affiliates [Line Items]            
Number of properties sold | officeAsset     2 4    
Aggregate gain on sale of properties     $ 557 $ 3,529    
Aggregate gross disposition price     $ 8,504 $ 45,208    
Office Building            
Investments in and Advances to Affiliates [Line Items]            
Proceeds from sale of joint venture $ 2,317