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RECEIVABLES
6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
RECEIVABLES
RECEIVABLES
A summary of accounts receivable as of June 30, 2016 and December 31, 2015 is as follows (in thousands):
 
 
June 30, 2016
 
December 31, 2015
 
(unaudited)
 
 
Trade accounts receivable
$
214,779

 
$
170,774

Unbilled revenues
73,284

 
47,098

Allowance for doubtful accounts
(5,739
)
 
(3,548
)
Total
$
282,324

 
$
214,324