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

Accrued liabilities consist of the following (in thousands): 
 
 
December 31,
 
 
2017
 
2016
Compensation and benefits payable
 
$
6,673

 
$
5,396

Property, sales, and other taxes
 
2,636

 
1,627

Customer credit balances
 
1,616

 
1,256

Accrued interest
 
1,690

 
—

Other
 
3,293

 
2,324

 
 
$
15,908

 
$
10,603