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ACCOUNTS AND OTHER RECEIVABLE, NET (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables, net $ 235,178 $ 246,564
Amounts billed, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables, net 213,560 227,528
Unbilled receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables, net $ 21,618 $ 19,036