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ACCRUED EXPENSES
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
ACCRUED EXPENSES
ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):
 
December 31,
 
2017
 
2016
Employee compensation and related costs
$
37,782

 
$
15,879

Professional fees
13,743

 
1,243

Other
24,855

 
9,918

 
$
76,380

 
$
27,040