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OTHER ACCRUED LIABILITIES (Tables)
 6 Months Ended
Jun. 30, 2018
Payables and Accruals [Abstract]  
Summary of Other Accrued Liabilities
A summary of other accrued liabilities as of June 30, 2018 and December 31, 2017 is as follows (in thousands):
 
 
June 30, 2018
 
December 31, 2017
 
(unaudited)
 
 
Payroll and other compensation expenses
$
44,912

 
$
40,988

Insurance accruals
14,831

 
15,799

Property, sales and other non-income related taxes
6,409

 
6,483

Lease commitments
1,007

 
1,616

Contract liabilities
3,462

 
6,102

Accrued commission
2,124

 
1,473

Accrued interest
5,237

 
5,950

Volume discount
2,700

 
1,545

Contingent consideration
438

 
1,246

Professional fees
1,432

 
1,098

Other
12,291

 
10,172

Total
$
94,843

 
$
92,472