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ACCOUNTS AND OTHER RECEIVABLE (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables, net $ 235,613 $ 246,564
Amounts billed, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables, net 219,073 227,528
Unbilled receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables, net $ 16,540 $ 19,036