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ACCOUNTS RECEIVABLE, NET (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following as of December 31:
(in thousands)
 
2015
 
2014
 
 
 
 
 
Billed
 
$
67,021

 
$
73,532

Unbilled
 
56,458

 
61,326

 
 
123,479

 
134,858

Less: allowance for doubtful accounts
 
(18,456
)
 
(22,675
)
 
 
 
 
 
Total
 
$
105,023

 
$
112,183