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Schedule III - Real Estate and Accumulated Depreciation (Changes in Real Estate and Accumulated Depreciation) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Real estate balance, beginning of the year $ 1,527,478,000 [1] $ 1,515,206,000 $ 1,508,682,000
Properties transferred to held for sale (184,639,000) (22,512,000) (36,265,000)
Property acquisitions     9,333,000
Outparcel dispositions (387,000) (840,000)  
Property impairments (83,224,000)    
Improvements and betterments 29,296,000 35,624,000 37,089,000
Asset write-offs     (3,633,000)
Real estate balance, end of the year 1,288,524,000 1,527,478,000 [1] 1,515,206,000
Accumulated depreciation balance, beginning of the year 428,569,000 389,861,000 361,969,000
Properties transferred to held for sale (55,165,000) (3,947,000) (10,143,000)
Outparcel dispositions   (90,000)  
Depreciation expense [2] 36,338,000 42,745,000 41,142,000
Asset write-offs     (3,107,000)
Accumulated depreciation balance end of the year 409,742,000 428,569,000 389,861,000
Net book value 878,782,000 $ 1,098,909,000 $ 1,125,345,000
Amount of encumbrance 164,200,000    
Difference between recorded cost of real estate and cost for federal tax purposes $ 34,500,000    
Minimum [Member]      
Estimated useful life of buildings and improvements 3 years    
Maximum [Member]      
Estimated useful life of buildings and improvements 40 years    
[1] At December 31, 2021, the aggregate cost for federal income tax purposes was approximately $34.5 million greater than the Company's recorded values.
[2] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.