Quarterly report pursuant to Section 13 or 15(d)

Properties, Net (Details)

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Properties, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investments in real estate    
Operating properties, net $ 2,760,632 $ 2,737,611
Operating Properties    
Investments in real estate    
Less: accumulated depreciation (839,478) (786,193)
Operating properties, net 2,760,632 2,737,611
Operating Properties | Land    
Investments in real estate    
Gross 469,494 455,680
Operating Properties | Buildings and improvements    
Investments in real estate    
Gross $ 3,130,616 $ 3,068,124