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ACCRUED EXPENSES
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
ACCRUED EXPENSES
ACCRUED EXPENSES
Accrued expenses consist of the following (in thousands):
 
December 31,
 
2018
 
2017
Accrued operating expenses
$
23,019

 
$
20,646

Compensation and benefits
16,974

 
12,295

Accrued royalties
2,286

 
4,091

Accrued interest
2,053

 
2,053

Product returns, rebates and other fees
1,533

 
1,972

Total
$
45,865

 
$
41,057