Annual report pursuant to Section 13 and 15(d)

Properties, Net (Details)

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Properties, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Properties        
Gross $ 4,348,006 $ 4,148,529 $ 3,980,813 $ 3,874,715
Operating properties, net 2,772,647 2,847,265    
Operating properties, net        
Properties        
Less: accumulated depreciation (1,007,120) (897,903)    
Operating properties, net 2,772,647 2,847,265    
Operating properties, net | Land        
Properties        
Gross 472,976 503,274    
Operating properties, net | Buildings and improvements        
Properties        
Gross $ 3,306,791 $ 3,241,894