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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jul. 01, 2017
Jul. 01, 2016
Related Party Transaction [Line Items]            
Total rental income $ 78,135 $ 71,852 $ 221,100 $ 207,318    
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     $ 800 700    
ICW Inc | Board of Directors Chairman            
Related Party Transaction [Line Items]            
Total rental income       1,600    
Prepaid Insurance         $ 200 $ 200
AAI Aviation, Inc. | Board of Directors Chairman            
Related Party Transaction [Line Items]            
Aviation expense     $ 100 $ 100