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Investment in and Advances to Non-Consolidated Entities (Details)
1 Months Ended 3 Months Ended 12 Months Ended 26 Months Ended
Sep. 01, 2012
USD ($)
shares
Feb. 28, 2017
USD ($)
Jul. 31, 2014
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
a
Dec. 31, 2016
USD ($)
Jan. 31, 2017
Investments in and Advances to Affiliates [Line Items]                
Non-recourse debt       $ 96,299,000        
Investment in joint venture       0 $ 1,293,000      
Equity in earnings of non-consolidated entities       113,000 1,910,000      
Joint Venture [Member]                
Investments in and Advances to Affiliates [Line Items]                
Payments to acquire interest in joint venture           $ 5,831,000    
Area of real estate property (in acres) | a           151    
Houston, TX [Member]                
Investments in and Advances to Affiliates [Line Items]                
Proceeds from divestiture of interest in joint venture           $ 49,085,000    
Construction cost             $ 79,964,000  
Maximum construction financing       $ 56,686,000        
Houston, TX [Member] | Joint Venture [Member]                
Investments in and Advances to Affiliates [Line Items]                
Ownership percentage       25.00%        
Lexington Realty Trust [Member]                
Investments in and Advances to Affiliates [Line Items]                
Non-recourse debt       $ 20,816,000        
LCIF [Member]                
Investments in and Advances to Affiliates [Line Items]                
Investment in joint venture       0 175,000      
Equity in earnings of non-consolidated entities       252,000 100,000      
LCIF [Member] | Net Lease Strategic Assets Fund L.P. [Member] | Equity Method Investments [Member]                
Investments in and Advances to Affiliates [Line Items]                
Ownership percentage 2.00%              
Investment in joint venture $ 189,000              
Limited partners' capital account, units issued (in units) | shares 457,211              
Partnership carrying value in NLS       5,639,000   6,175,000    
Equity in earnings of non-consolidated entities       247,000 97,000      
Contributions to equity method investment         175,000      
Distributions received       $ 783,000 $ 250,000      
LCIF [Member] | Office Building [Member] | Philadelphia, Pennsylvania [Member]                
Investments in and Advances to Affiliates [Line Items]                
Ownership percentage     1.00%          
Investment in non-consolidated entity     $ 263,000          
Joint Venture [Member] | Houston, TX [Member]                
Investments in and Advances to Affiliates [Line Items]                
Face amount of debt instrument           $ 50,000,000    
Minimum [Member]                
Investments in and Advances to Affiliates [Line Items]                
Ownership percentage       15.00%        
Maximum [Member]                
Investments in and Advances to Affiliates [Line Items]                
Ownership percentage       25.00%        
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member]                
Investments in and Advances to Affiliates [Line Items]                
Ownership percentage               40.00%
Proceeds from divestiture of interest in joint venture   $ 6,198,000            
Gain on sale of properties   1,452,000            
Proceeds from collection of loans receivable   $ 8,420,000