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RECEIVABLES
3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
RECEIVABLES
RECEIVABLES
A summary of accounts receivable as of March 31, 2019 and December 31, 2018 is as follows (in thousands): 
 
March 31, 2019
 
December 31, 2018
 
(unaudited)
 
 
Trade accounts receivable
$
182,487

 
$
207,266

Unbilled receivables
76,302

 
76,268

Allowance for doubtful accounts
(14,483
)
 
(15,182
)
Total
$
244,306

 
$
268,352