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SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING STANDARDS - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Accounting Policies [Abstract]      
Cash and cash equivalents $ 287,639 $ 104,458 $ 95,184
Restricted cash $ 109   $ 246