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DEBT - Summary of Total Unsecured Notes Payable Outstanding (Details)
$ in Thousands
Sep. 10, 2024
USD ($)
Jul. 17, 2019
USD ($)
May 11, 2017
USD ($)
Jan. 18, 2017
USD ($)
Sep. 30, 2025
USD ($)
interest_rate_swap_agreement
Dec. 31, 2024
USD ($)
Sep. 17, 2024
Sep. 09, 2024
USD ($)
Jan. 26, 2021
Jul. 30, 2019
May 23, 2017
Mar. 01, 2017
Debt Instrument [Line Items]                        
Debt discount and issuance costs, net of accumulated amortization of $8,186 and $9,890, respectively         $ (162) $ (648)            
Accumulated amortization         2,429 1,943            
American Assets Trust, L.P. | Treasury Lock                        
Debt Instrument [Line Items]                        
Gain on derivatives   $ 500 $ 700 $ 10,400                
Notional amount $ 150,000             $ 150,000        
Loss on derivatives $ 1,300                      
American Assets Trust, L.P. | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         1,625,000 1,950,000            
Debt discount and issuance costs, net of accumulated amortization of $8,186 and $9,890, respectively         (12,772) (14,244)            
Total Secured Notes Payable Outstanding         1,612,228 1,935,756            
Accumulated amortization         $ 8,186 9,890            
American Assets Trust, L.P. | Term Loan A | Interest Rate Swap                        
Debt Instrument [Line Items]                        
Number of interest rate agreements | interest_rate_swap_agreement         2              
Fixed interest rate on derivative         2.70%              
American Assets Trust, L.P. | Term Loan A | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         $ 100,000 100,000            
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         0 150,000            
American Assets Trust, L.P. | Term Loan C | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         0 75,000            
American Assets Trust, L.P. | Senior Guaranteed Notes, Series C | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         $ 0 100,000            
Stated Interest Rate         4.50%              
American Assets Trust, L.P. | Senior Guaranteed Notes, Series D | Treasury Lock                        
Debt Instrument [Line Items]                        
Effective interest rate         3.87%              
American Assets Trust, L.P. | Senior Guaranteed Notes, Series D | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         $ 250,000 250,000            
Stated Interest Rate         4.29%             4.29%
American Assets Trust, L.P. | Senior Guaranteed Notes, Series E | Treasury Lock                        
Debt Instrument [Line Items]                        
Effective interest rate         4.18%              
American Assets Trust, L.P. | Senior Guaranteed Notes, Series E | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         $ 100,000 100,000            
Stated Interest Rate         4.24%           4.24%  
American Assets Trust, L.P. | Senior Guaranteed Notes, Series G | Treasury Lock                        
Debt Instrument [Line Items]                        
Effective interest rate         3.88%              
American Assets Trust, L.P. | Senior Guaranteed Notes, Series G | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         $ 150,000 150,000            
Stated Interest Rate         3.91%         3.91%    
American Assets Trust, L.P. | 3.375% Senior Notes                        
Debt Instrument [Line Items]                        
Stated Interest Rate                 3.375%      
American Assets Trust, L.P. | 3.375% Senior Notes | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         $ 500,000 500,000            
Stated Interest Rate         3.375%       3.375%      
Effective interest rate                 3.502%      
American Assets Trust, L.P. | 6.150% Senior Notes                        
Debt Instrument [Line Items]                        
Stated Interest Rate             6.15%          
American Assets Trust, L.P. | 6.150% Senior Notes | Treasury Lock                        
Debt Instrument [Line Items]                        
Effective interest rate         6.209%              
American Assets Trust, L.P. | 6.150% Senior Notes | Unsecured term loans, net                        
Debt Instrument [Line Items]                        
Principal Balance         $ 525,000 $ 525,000            
Stated Interest Rate         6.15%   6.15%          
Effective interest rate             6.194%          
American Assets Trust, L.P. | Term Loan B & Term Loan C | Interest Rate Swap | First period                        
Debt Instrument [Line Items]                        
Fixed interest rate on derivative         5.47%              
American Assets Trust, L.P. | Term Loan B & Term Loan C | Interest Rate Swap | Second period                        
Debt Instrument [Line Items]                        
Fixed interest rate on derivative         5.57%