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SUPPLEMENTAL CASH FLOW INFORMATION - Table 3 - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 23,500 $ 153,625    
Cash, cash equivalents and restricted cash 32,302 162,426 $ 26,077 $ 24,980
Cash and cash equivalents [Member]        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents 23,500 153,625    
Other long-term assets, net [Member]        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash, cash equivalents and restricted cash $ 8,802 $ 8,801