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Investment in and Advances to Non-Consolidated Entities (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 26 Months Ended
Sep. 01, 2012
Feb. 28, 2017
Jan. 31, 2016
Jul. 31, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Jan. 31, 2017
Jun. 30, 2015
Investments in and Advances to Affiliates [Line Items]                      
Non-recourse debt         $ 46,661,000   $ 46,661,000        
Real estate, at cost         3,837,705,000   3,837,705,000   $ 3,533,172,000    
Investment in joint venture             4,068,000 $ 33,554,000      
Equity in earnings (losses) of non-consolidated entities         283,000 $ 340,000 (1,064,000) 6,394,000      
Palm Beach Gardens, Florida [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Impairment of real estate             3,512,000        
Real estate, at cost         $ 0   0        
Houston, TX [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Construction cost                 79,964,000    
Maximum construction financing             56,686,000        
Investment in joint venture             $ 48,771,000        
Houston, TX [Member] | Joint Venture [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Ownership percentage         25.00%   25.00%        
Office Building [Member] | Russellville, Arkansas [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Proceeds from divestiture of interest in joint venture     $ 6,681,000                
Gain on sale of properties     $ 5,378,000                
Lexington Realty Trust [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Non-recourse debt         $ 8,395,000   $ 8,395,000        
LCIF [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Real estate, at cost         761,733,000   761,733,000   731,202,000    
Investment in joint venture             1,067,000 81,000      
Equity in earnings (losses) of non-consolidated entities         79,000 $ 49,000 338,000 252,000      
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) 457,211                    
Partnership carrying value in NLS         $ 5,436,000   5,436,000   $ 5,224,000    
Equity in earnings (losses) of non-consolidated entities             323,000 236,000      
Contributions to equity method investment             1,067,000 81,000      
Distributions received             $ 1,178,000 $ 661,000      
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              
Minimum [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Ownership percentage         15.00%   15.00%        
Maximum [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Ownership percentage         25.00%   25.00%        
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member]                      
Investments in and Advances to Affiliates [Line Items]                      
Ownership percentage                   40.00% 40.00%
Proceeds from divestiture of interest in joint venture   $ 6,198,000                  
Gain on sale of properties   $ 1,452,000