ACCOUNTS RECEIVABLE, NET (Tables)
 6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following:
(in thousands)
 
June 30,
2016
 
December 31,
2015
 
 
 
 
 
Billed
 
$
61,211

 
$
67,021

Unbilled
 
50,548

 
56,458

 
 
111,759

 
123,479

Less: allowance for doubtful accounts
 
(11,594
)
 
(18,456
)
 
 
 
 
 
Total
 
$
100,165

 
$
105,023