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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jul. 01, 2017
Jul. 01, 2016
Related Party Transaction [Line Items]            
Total rental income $ 72,925 $ 68,221 $ 142,965 $ 135,466    
Investment in WBW CHP LLC (in percent)     47.70%      
WBW CHP LLC            
Related Party Transaction [Line Items]            
Amount recovered for reimbursements of operating expense for related party     $ 500 400    
ICW Inc | Board of Directors Chairman            
Related Party Transaction [Line Items]            
Total rental income       $ 1,100    
Prepaid Insurance           $ 200
Subsequent Event | ICW Inc | Board of Directors Chairman            
Related Party Transaction [Line Items]            
Prepaid Insurance         $ 200