OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Payroll and other compensation expenses		$ 47,764	$ 47,988
Insurance accruals		15,452	16,001
Property, sales and other non-income related taxes		3,684	7,271
Lease commitments		37	1,145
Contract liabilities	[1]	2,014	1,784
Accrued commission		2,284	2,290
Accrued interest		2,522	5,261
Volume discount		3,508	4,322
Contingent consideration		0	429
Professional fees		1,433	1,219
Other accrued liabilities		7,426	7,598
Total		$ 86,124	$ 95,308

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