OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Payroll and other compensation expenses		$ 41,819	$ 47,988
Insurance accruals		12,076	16,001
Property, sales and other non-income related taxes		6,188	7,271
Lease commitments		34	1,145
Contract liabilities	[1]	1,738	1,784
Accrued commission		2,894	2,290
Accrued interest		5,167	5,261
Volume discount		3,680	4,322
Contingent consideration		0	429
Professional fees		1,166	1,219
Other accrued liabilities		5,083	7,598
Total		$ 79,845	$ 95,308

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