RESTRUCTURING - Summary of Costs Incurred by Segment Related to Restructuring (Details) $ in Thousands		3 Months Ended		9 Months Ended		31 Months Ended
		Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) employee	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) employee	Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)		$ 35	$ 11,503	$ (81)	$ 18,818
Number of employees terminated | employee			400		750
Employee Severance and Benefit Costs
Restructuring Cost and Reserve [Line Items]
Cumulative incurred costs						$ 80,100
Restructuring charges (credits)	[1]	48	$ 7,958	(298)	$ 13,032
Asset Impairments Related to Restructuring
Restructuring Cost and Reserve [Line Items]
Cumulative incurred costs						$ 7,500
Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)		(13)	3,545	217	5,786
North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)		0	6,971	177	11,901
North America | Employee Severance and Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	[1]	0	3,662	0	8,127
North America | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)		0	3,309	177	3,774
International
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)		35	4,532	(258)	6,917
International | Employee Severance and Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	[1]	48	4,296	(298)	4,905
International | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)		$ (13)	$ 236	$ 40	$ 2,012
Facility Closing | International
Restructuring Cost and Reserve [Line Items]
Number of countries in which operations were ceased within			17		17

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