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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property and Equipment      
Impairment charge $ 0 $ 0 $ 0
Site improvements | Minimum      
Property and Equipment      
Estimated useful life 15 years    
Site improvements | Maximum      
Property and Equipment      
Estimated useful life 40 years    
Buildings | Minimum      
Property and Equipment      
Estimated useful life 30 years    
Buildings | Maximum      
Property and Equipment      
Estimated useful life 40 years    
Building improvements | Minimum      
Property and Equipment      
Estimated useful life 5 years    
Building improvements | Maximum      
Property and Equipment      
Estimated useful life 40 years    
Furniture | Minimum      
Property and Equipment      
Estimated useful life 5 years    
Furniture | Maximum      
Property and Equipment      
Estimated useful life 10 years    
Equipment | Minimum      
Property and Equipment      
Estimated useful life 3 years    
Equipment | Maximum      
Property and Equipment      
Estimated useful life 20 years