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ACCOUNTS RECEIVABLE, NET (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following as of December 31:
(in thousands)
 
2016
 
2015
 
 
 
 
 
Billed
 
$
58,392

 
$
67,021

Unbilled
 
39,853

 
56,458

 
 
98,245

 
123,479

Less: allowance for doubtful accounts
 
(10,424
)
 
(18,456
)
 
 
 
 
 
Total
 
$
87,821

 
$
105,023