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LEASES - Property and Equipment Costs (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Property, Plant and Equipment [Line Items]          
Net $ 9,122 $ 9,590 $ 9,422 $ 9,736 $ 9,855
Assets Leased to Others          
Property, Plant and Equipment [Line Items]          
Cost 31,866        
Accumulated depreciation (26,355)        
Net $ 5,511        
Cost   36,190      
Accumulated depreciation   (30,473)      
Net   $ 5,717