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RECEIVABLES (Tables)
 6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Summary of Accounts Receivable
A summary of accounts receivable as of June 30, 2019 and December 31, 2018 is as follows (in thousands): 
 
June 30, 2019
 
December 31, 2018
 
(unaudited)
 
 
Trade accounts receivable
$
205,081

 
$
207,266

Unbilled receivables
74,454

 
76,268

Allowance for doubtful accounts
(14,431
)
 
(15,182
)
Total
$
265,104

 
$
268,352