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OTHER ACCRUED LIABILITIES
 6 Months Ended
Jun. 30, 2016
Payables and Accruals [Abstract]  
OTHER ACCRUED LIABILITIES
OTHER ACCRUED LIABILITIES
A summary of other accrued liabilities as of June 30, 2016 and December 31, 2015 is as follows (in thousands):
 
 
June 30, 2016
 
December 31, 2015
 
(unaudited)
 
 
Payroll and other compensation expenses
$
34,476

 
$
21,878

Insurance accruals
10,102

 
7,008

Property, sales and other non-income related taxes
6,009

 
3,058

Contingent consideration
5,966

 
3,638

Deferred revenue
3,136

 
1,355

Lease commitments
2,411

 
1,721

Accrued commission
1,854

 
1,159

Volume discount
626

 
1,280

Accrued interest
591

 
984

Acquisition-related costs
229

 
370

Other
9,712

 
7,345

Total
$
75,112

 
$
49,796