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SUPPLEMENTAL CASH FLOW INFORMATION (Details Narrative) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]        
Interest expense paid $ 16,879 $ 31,029    
Cash and cash equivalents, and restricted cash $ 82,247 $ 92,768 $ 106,615 $ 88,538