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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 12 Months Ended
Feb. 28, 2019
USD ($)
Dec. 31, 2018
USD ($)
a
term
Sep. 30, 2019
USD ($)
office_asset
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
a
building
term
Dec. 31, 2017
a
Investments in and Advances to Affiliates [Line Items]            
Investment balance   $ 66,183 $ 53,796   $ 66,183  
Unconsolidated Properties            
Investments in and Advances to Affiliates [Line Items]            
Aggregate gross disposition price $ 2,317          
Gain (loss) on disposition of assets $ 824          
NNN Office Joint Venture            
Investments in and Advances to Affiliates [Line Items]            
Non-recourse debt     374,680      
NNN Office Joint Venture | Mortgages            
Investments in and Advances to Affiliates [Line Items]            
Non-recourse debt   $ 362,800     $ 362,800  
Long-term debt, term   3 years     3 years  
Number of additional extensions available | term   2     2  
Term of additional extensions         1 year  
Term of contract         2 years  
NNN Office Joint Venture | Mortgages | London Interbank Offered Rate (LIBOR)            
Investments in and Advances to Affiliates [Line Items]            
Basis spread on variable rate         2.00%  
Basis spread rate increase per extension         0.15%  
Cap interest rate   4.00%     4.00%  
NNN Office Joint Venture Properties            
Investments in and Advances to Affiliates [Line Items]            
Aggregate gain on sale of properties     3,529      
Equity method investment, assets     603,100      
Equity method investment, liabilities     394,142      
Office Building | Transferred Property            
Investments in and Advances to Affiliates [Line Items]            
Aggregate gross disposition price     $ 448,900 $ 967,799    
Office Building | NNN Office Joint Venture Properties | Transferred Property            
Investments in and Advances to Affiliates [Line Items]            
Number of properties sold | building         21  
Aggregate gross disposition price         $ 725,800  
NNN Office Joint Venture            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage   20.00% 20.00%   20.00%  
Investment balance   $ 53,144 $ 41,780   $ 53,144  
Proceeds from repayment of debt     45,208      
NNN Office Joint Venture | Mortgages            
Investments in and Advances to Affiliates [Line Items]            
Non-recourse mortgage loan     $ 101,520      
NNN Office Joint Venture | NNN Office Joint Venture Properties            
Investments in and Advances to Affiliates [Line Items]            
Number of properties sold | office_asset     4      
Aggregate gross disposition price     $ 148,450      
Aggregate gain on sale of properties     $ 17,644      
NNN Office Joint Venture | 2 of 21 Transferred Properties            
Investments in and Advances to Affiliates [Line Items]            
Fair value of contributed property         45,653  
Payments to acquire interest in joint venture         8,053  
Gain (loss) on disposition of assets         14,645  
Loans assumed         103,400  
Etna Park 70            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage     90.00%      
Investment balance   4,774 $ 6,661   $ 4,774  
Payments to acquire interest in joint venture   $ 3,008        
Area of real estate property | a   57     57 151
Other Joint Ventures            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage     25.00%      
Investment balance   $ 8,265 $ 5,355   $ 8,265  
Non-consolidated Real Estate Entity            
Investments in and Advances to Affiliates [Line Items]            
Ownership percentage 15.00%