Annual report pursuant to Section 13 and 15(d)

Properties, Net (Operating properties, net) (Details)

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Properties, Net (Operating properties, net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating properties, net        
Gross $ 4,686,802 $ 4,348,006 $ 4,148,529 $ 3,980,813
Operating properties, net 3,115,280 2,772,647    
Operating properties, net        
Operating properties, net        
Less: accumulated depreciation (1,124,253) (1,007,120)    
Operating properties, net 3,115,280 2,772,647    
Operating properties, net | Land        
Operating properties, net        
Gross 528,269 472,976    
Operating properties, net | Buildings and improvements        
Operating properties, net        
Gross $ 3,711,264 $ 3,306,791