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Investment in Unconsolidated Entities - Narrative (Details)
 3 Months Ended 9 Months Ended
Jan. 19, 2023
USD ($)
Jan. 18, 2023
USD ($)
property
interest_rate_swap
Sep. 30, 2023
USD ($)
unconsolidated_entity
Sep. 30, 2022
USD ($)
unconsolidated_entity
Sep. 30, 2023
USD ($)
unconsolidated_entity
Sep. 30, 2022
USD ($)
unconsolidated_entity
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Mar. 16, 2023
USD ($)
Dec. 31, 2022
USD ($)
unconsolidated_entity
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Variable Interest Entity [Line Items]                          
Number of equity method investments | unconsolidated_entity     1   1                
Gain on sale of real estate   $ 24,900,000                      
Distributions from unconsolidated entities         $ 91,355,000 $ 47,355,000              
Net assets     $ 1,571,532,000 $ 1,618,747,000 1,571,532,000 1,618,747,000 $ 1,582,937,000 $ 1,586,405,000   $ 1,603,909,000 $ 1,619,489,000 $ 1,584,206,000 $ 1,571,552,000
Gain on sale of derivatives   $ 1,400,000                      
Interest Rate Swap                          
Variable Interest Entity [Line Items]                          
Number of instruments acquired | interest_rate_swap   2                      
Notional amount   $ 75,000,000             $ 100,000,000        
IAGM                          
Variable Interest Entity [Line Items]                          
Number of properties acquired | property   4                      
Purchase price   $ 222,300,000                      
Assumed aggregate mortgage debt   92,500,000                      
Distributions from unconsolidated entities $ 71,400,000                        
IAGM                          
Variable Interest Entity [Line Items]                          
Gain on sale of real estate     0 0 45,208,000 4,995,000              
Net assets     7,028,000   7,028,000         $ 127,299,000      
Cash and cash equivalents     9,200,000   9,200,000                
Gain on sale of derivatives     $ 2,556,000 $ 0              
IAGM Retail Fund LLC                          
Variable Interest Entity [Line Items]                          
Gain on sale of derivatives   $ 2,600,000                      
IAGM Retail Fund LLC                          
Variable Interest Entity [Line Items]                          
Ownership percentage   100.00% 55.00%   55.00%         55.00%      
Number of equity method investments | unconsolidated_entity     1 1 1 1       1      
Gain on sale of real estate   $ 45,200,000                      
Deferred gain on real estates         $ 39,900,000