OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Payroll and other compensation expenses		$ 59,040	$ 47,988
Insurance accruals		13,400	16,001
Property, sales and other non-income related taxes		5,688	7,271
Lease commitments		35	1,145
Contract liabilities	[1]	1,181	1,784
Accrued commission		3,341	2,290
Accrued interest		2,138	5,261
Volume discount		3,811	4,322
Contingent consideration		0	429
Professional fees		1,350	1,219
Other		4,705	7,598
Total		$ 94,689	$ 95,308

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