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OVERVIEW AND BASIS OF PRESENTATION (TABLES) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 75,517 $ 78,237    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 86,929 $ 78,237 $ 71,260 $ 74,437
Prepaid Expenses and Other Current Assets [Member]        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 11,400      
Other Noncurrent Assets [Member]        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 12