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ACCRUED EXPENSES (Tables)
12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Schedule of accrued expenses
Accrued expenses consist of the following (in thousands):
 
December 31,
 
2017
 
2016
Compensation and benefits
$
12,295

 
$
11,228

Accrued operating expenses
20,646

 
16,538

Accrued royalties
4,091

 
3,822

Accrued interest
2,053

 
1,605

Product returns, rebates and other fees
1,972

 
3,473

Total
$
41,057

 
$
36,666