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RECEIVABLES
 9 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
RECEIVABLES
RECEIVABLES
A summary of accounts receivable as of September 30, 2019 and December 31, 2018 is as follows (in thousands): 
 
September 30, 2019
 
December 31, 2018
 
(unaudited)
 
 
Trade accounts receivable
$
178,745

 
$
207,266

Unbilled receivables
97,342

 
76,268

Allowance for doubtful accounts
(12,582
)
 
(15,182
)
Total
$
263,505

 
$
268,352