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PROPERTIES - Summary of our investment in leased real estate properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Total real estate investments $ 7,746,410 $ 7,655,960  
Less accumulated depreciation (1,562,619) (1,376,828)  
Real estate investments - net 6,183,791 6,279,132  
Capitalized interest 11,100 8,000 $ 6,600
Building      
Property, Plant and Equipment [Line Items]      
Total real estate investments 6,056,820 6,098,119  
Land      
Property, Plant and Equipment [Line Items]      
Total real estate investments 786,174 795,874  
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Total real estate investments 447,610 440,737  
Site improvements      
Property, Plant and Equipment [Line Items]      
Total real estate investments 250,917 227,150  
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Total real estate investments $ 204,889 $ 94,080