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OTHER ACCRUED LIABILITIES
 9 Months Ended
Sep. 30, 2018
Payables and Accruals [Abstract]  
OTHER ACCRUED LIABILITIES
OTHER ACCRUED LIABILITIES
A summary of other accrued liabilities as of September 30, 2018 and December 31, 2017 is as follows (in thousands):
 
 
September 30, 2018
 
December 31, 2017
 
(unaudited)
 
 
Payroll and other compensation expenses
$
58,814

 
$
40,988

Insurance accruals
15,497

 
15,799

Property, sales and other non-income related taxes
6,562

 
6,483

Lease commitments
827

 
1,616

Contract liabilities
1,457

 
6,102

Accrued commission
2,592

 
1,473

Accrued interest
2,502

 
5,950

Volume discount
3,764

 
1,545

Contingent consideration
435

 
1,246

Professional fees
769

 
1,098

Other
6,813

 
10,172

Total
$
100,032

 
$
92,472