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SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING STANDARDS - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Document Period End Date Sep. 30, 2019      
Cash and cash equivalents $ 95,184 $ 39,623 $ 47,812  
Restricted cash 246   20,000  
Cash, cash equivalents and restricted cash $ 95,430 $ 59,870 $ 67,812 $ 21,262