OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
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
Deferred revenue	3,136	1,355
Acquisition-related costs	229	370
Contingent consideration	5,966	3,638
Lease commitments	2,411	1,721
Accrued commission	1,854	1,159
Accrued interest	591	984
Volume discount	626	1,280
Other	9,712	7,345
Total	$ 75,112	$ 49,796