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RECEIVABLES (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Trade accounts receivable $ 182,487 $ 207,266
Unbilled receivables 76,302 76,268
Allowance for doubtful accounts (14,483) (15,182)
Total [1] $ 244,306 $ 268,352
[1] Includes billed and unbilled amounts, net of allowance for doubtful accounts. See Note 3 for details.