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OTHER ACCRUED LIABILITIES
 12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
OTHER ACCRUED LIABILITIES
OTHER ACCRUED LIABILITIES
A summary of other accrued liabilities as of December 31, 2018 and 2017 is as follows (in thousands):
 
 
December 31,
 
2018
 
2017
Payroll and other compensation expenses
$
47,988

 
$
40,988

Insurance accruals
16,001

 
15,799

Property, sales and other non-income related taxes
7,271

 
6,483

Lease commitments
1,145

 
1,616

Contract liabilities
1,784

 
6,102

Accrued commission
2,290

 
1,473

Accrued interest
5,261

 
5,950

Volume discount
4,322

 
1,545

Contingent consideration
429

 
1,246

Professional fees
1,219

 
1,098

Other
7,598

 
10,172

Total
$
95,308

 
$
92,472