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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 01, 2021
Mar. 01, 2019
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Related Party Transaction [Line Items]            
Rental income     $ 105,468 $ 93,804 $ 301,470 $ 262,573
Investment in WBW CHP LLC (as a percent)         47.70%  
WBW CHP LLC            
Related Party Transaction [Line Items]            
Amount recovered for reimbursements of operating expense for related party         $ 900 800
American Assets, Inc. | Board of Directors Chairman            
Related Party Transaction [Line Items]            
Term of contract (in years) 10 years 3 years        
Rental income $ 200 $ 200     200 200
AAI Aviation, Inc. | Board of Directors Chairman            
Related Party Transaction [Line Items]            
Aviation expense         $ 200 $ 200