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OTHER ACCRUED LIABILITIES
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
OTHER ACCRUED LIABILITIES
OTHER ACCRUED LIABILITIES
A summary of other accrued liabilities as of December 31, 2017 and 2016 is as follows (in thousands):
 
 
December 31,
 
2017
 
2016
Payroll and other compensation expenses
$
40,988

 
$
38,214

Insurance accruals
15,799

 
13,896

Property, sales and other non-income related taxes
6,483

 
5,599

Lease commitments
1,616

 
2,119

Deferred revenue
6,102

 
3,433

Accrued commission
1,473

 
1,355

Accrued interest
5,950

 
603

Volume discount
1,545

 
1,067

Contingent consideration
1,246

 
2,103

Professional fees
1,098

 
1,530

Other
10,172

 
9,985

Total
$
92,472

 
$
79,904