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Investments in Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details)
$ in Thousands
1 Months Ended 6 Months Ended
May 31, 2019
USD ($)
Feb. 28, 2019
USD ($)
Dec. 31, 2018
USD ($)
a
Jun. 30, 2020
USD ($)
numberOfPartnerships
office_asset
Dec. 31, 2019
USD ($)
a
Dec. 31, 2017
a
Investments in and Advances to Affiliates [Line Items]            
Investment balance       $ 56,040 $ 57,168  
Number of joint venture interests | numberOfPartnerships       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       $ 35,666 39,288  
Etna Park 70 LLC            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage       90.00%    
Investment balance       $ 10,229 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       $ 5,148 $ 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       $ 4,997 $ 5,218  
Mortgages | NNN Office JV LP            
Investments in and Advances to Affiliates [Line Items]            
Non-recourse mortgage loan       $ 12,960    
NNN Office Joint Venture Properties            
Investments in and Advances to Affiliates [Line Items]            
Aggregate gain on sale of properties   $ 803        
NNN Office Joint Venture Properties | NNN Office JV LP            
Investments in and Advances to Affiliates [Line Items]            
Number of properties sold | office_asset       1    
Aggregate gain on sale of properties $ 270     $ 550    
Aggregate gross disposition price       $ 3,419    
Office Building            
Investments in and Advances to Affiliates [Line Items]            
Proceeds from sale of joint venture   $ 2,317