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REAL ESTATE INVESTMENTS - Summary of Office Properties Sold (Details)
$ in Thousands
 12 Months Ended
Sep. 11, 2019
USD ($)
ft²
Mar. 15, 2019
USD ($)
a
Dec. 21, 2018
USD ($)
ft²
Dec. 20, 2018
USD ($)
ft²
Jun. 21, 2018
USD ($)
ft²
Mar. 16, 2018
USD ($)
a
Jan. 10, 2018
USD ($)
a
Nov. 22, 2017
USD ($)
a
Oct. 31, 2017
USD ($)
a
Sep. 13, 2017
USD ($)
a
Jul. 18, 2017
USD ($)
a
Jun. 27, 2017
USD ($)
ft²
Jun. 12, 2017
USD ($)
ft²
Apr. 28, 2017
USD ($)
a
Mar. 30, 2017
USD ($)
ft²
Mar. 15, 2017
USD ($)
ft²
Mar. 13, 2017
USD ($)
ft²
Feb. 15, 2017
USD ($)
a
Feb. 02, 2017
USD ($)
ft²
Jan. 30, 2017
USD ($)
a
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Gain (Loss) on Sale                                         $ 356 $ 2,932 $ 32,017
Office Properties | 1900 Gallows Rd                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft² 210,632                                            
Sales Price $ 36,400                                            
Gain (Loss) on Sale $ (367)                                            
Office Properties | Rockpoint Portfolio                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²       1,293,197                                      
Sales Price       $ 312,000                                      
Gain (Loss) on Sale       $ 397                                      
Office Properties | 20 East Clementon Road                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²         38,260                                    
Sales Price         $ 2,000                                    
Gain (Loss) on Sale         $ (35)                                    
Office Properties | 11, 14, 15, 17 and 18 Campus Boulevard (Newtown Square)                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | a               252,802                              
Sales Price               $ 42,000                              
Gain (Loss) on Sale               $ 19,642                              
Office Properties | 630 Allendale Road                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | a                 150,000                            
Sales Price                 $ 17,500                            
Gain (Loss) on Sale                 $ 3,605                            
Office Properties | Two, Four A, Four B and Five Eves Drive (Evesham Corporate Center)                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²                       134,794                      
Sales Price                       $ 9,700                      
Gain (Loss) on Sale                       $ (325)                      
Office Properties | 200, 210 & 220 Lake Drive East (Woodland Falls)                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²                             215,465                
Sales Price                             $ 19,000                
Gain (Loss) on Sale                             $ (249)                
Office Properties | 11700, 11710, 11720 & 11740 Beltsville Drive (Calverton)                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²                                 313,810            
Sales Price                                 $ 9,000            
Gain (Loss) on Sale                                 $ 0            
Office Properties | 1200 & 1220 Concord Avenue (Concord Airport Plaza)                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²                                     350,256        
Sales Price                                     $ 33,100        
Gain (Loss) on Sale                                     $ 551        
Land                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Gain (Loss) on Sale                                         1,000    
Land | 9 Presidential Boulevard                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a   2.7                                          
Sales Price   $ 5,325                                          
Gain (Loss) on Sale   $ 751                                          
Land | Garza Ranch Office                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a           6.6                                  
Sales Price           $ 14,571                                  
Gain (Loss) on Sale           $ 1,515                                  
Land | Westpark Land                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a             13.1                                
Sales Price             $ 485                                
Gain (Loss) on Sale             $ 22                                
Land | 50 E. Swedesford Square                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a                   12.0                          
Sales Price                   $ 7,200                          
Gain (Loss) on Sale                   $ 882                          
Land | Bishops Gate                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a                     49.5                        
Sales Price                     $ 6,000                        
Gain (Loss) on Sale                     $ 71                        
Land | Garza Ranch - Multi-family                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a                           8.4                  
Sales Price                           $ 11,800                  
Gain (Loss) on Sale                           $ 1,311             $ 3,000    
Land | Gateway Land - Site C                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a                                   4.8          
Sales Price                                   $ 1,100          
Gain (Loss) on Sale                                   $ 0          
Land | Garza Ranch - Hotel                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Acres | a                                       1.7      
Sales Price                                       $ 3,500      
Gain (Loss) on Sale                                       $ 192      
Retail Properties | 7000 Midlantic Drive                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²                         10,784                    
Sales Price                         $ 8,200                    
Gain (Loss) on Sale                         $ 1,413                    
Mixed-use Properties | Subaru National Training Center                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²     83,000                                        
Sales Price     $ 45,300                                        
Gain (Loss) on Sale     $ 2,570                                        
Mixed-use Properties | Philadelphia Marine Center (Marine Piers)                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                              
Rentable square feet | ft²                               181,900              
Sales Price                               $ 21,400              
Gain (Loss) on Sale                               $ 6,498