EXIT AND DISPOSAL ACTIVITIES (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2017 USD ($)
Exit and disposal activities
Number of facilities closed | item			15
Charges related to exit and disposal activities	$ 900	$ 1,900
Amount reclassed to accrued lease obligations		200
Accrued expenses and other current liabilities	91,400			$ 81,112
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	22,604	19,069
Restructuring Reserve, Ending Balance	21,637	20,405	$ 19,069
Accrued Liabilities
Exit and disposal activities
Accrued expenses and other current liabilities	3,300
Lease obligations and terminations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	21,350	18,000
Provision for Restructuring	871	1,863
Payments for Restructuring	1,838	712
Restructuring Reserve, Ending Balance	20,383	19,151	18,000
Reclassifications of deferred rent
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	1,254	1,069
Restructuring Reserve, Ending Balance	$ 1,254	$ 1,254	$ 1,069