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Derivative Instruments and Hedging Activities (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
derivative
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2021
derivative
Dec. 31, 2021
USD ($)
derivative
Derivative [Line Items]          
Interest rate swap agreements settled | derivative 0     0 0
Derivative liability fair value gross $ 7,613 $ 26,452     $ 26,452
Seritage | Landmark Mall Property          
Derivative [Line Items]          
Fair value of property contributed   30,000      
Interest Rate Swap          
Derivative [Line Items]          
Reduction in interest expense 300   $ 800    
Interest Rate Swap | Designated as Hedging Instrument          
Derivative [Line Items]          
Loss on derivative expected amount to be reclassified 6,600        
Credit Risk Contract          
Derivative [Line Items]          
Derivative liability fair value gross $ 9,400 $ 28,500     $ 28,500