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DISPOSALS OF OPERATING PROPERTIES AND IMPAIRMENT CHARGES (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
groundLease
lease
property
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of ground lease properties | lease 12    
Depreciation and amortization $ 0 $ 0 $ 37,723
Seven unnamed impaired properties      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of real estate properties | property     7
Depreciation and amortization     $ 37,700
Property, plant, and equipment, fair value disclosure     176,000
Disposed of by sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of real estate properties | property   0  
Proceeds from sale of real estate 42,000    
Gain on disposal $ 27,600    
Number of ground lease properties | groundLease 17    
2021 Operating Properties Sold      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of real estate $ 24,800    
Gain on disposal $ 4,300    
2021 Operating Properties Sold | Disposed of by sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of real estate properties | property 1    
2020 Redevelopment Property Sold      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of real estate   $ 14,000  
Gain on disposal   $ 3,100  
2020 Redevelopment Property Sold | Disposed of by sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of real estate properties | property   1  
2019 Operating Properties Sold      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of real estate     543,800
Gain on disposal     $ 39,000
2019 Operating Properties Sold | Disposed of by sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of real estate properties | property     23