OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Jan. 01, 2018	[1]	Dec. 31, 2017
Payables and Accruals [Abstract]
Payroll and other compensation expenses	$ 50,272				$ 40,988
Insurance accruals	14,790				15,799
Property, sales and other non-income related taxes	4,685				6,483
Lease commitments	1,399				1,616
Contract liabilities	3,799	[1]	$ 5,415		6,102
Accrued commission	1,263				1,473
Accrued interest	2,632				5,950
Volume discount	2,684				1,545
Contingent consideration	616				1,246
Professional fees	1,784				1,098
Other accrued liabilities	9,056				10,172
Total	$ 92,980				$ 92,472

[1] Included in the “Other accrued liabilities” line of the condensed consolidated balance sheet.