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RESTRUCTURINGS - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Jun. 28, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Restructuring expense		$ 553	$ 279	$ 4,500	$ 4,536	$ 9,163	$ 9,100
Percentage of workforce reduction	9.00%
Outstanding unpaid accrued liabilities		$ 688	$ 285	$ 688	$ 688	$ 285	$ 202	$ 2,681	$ 687	$ 0

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- Definition

Restructuring Charges and Disposal Group, Including Discontinued Operation, Restructuring Charges

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- Definition

Restructuring Reserve and Disposal Group, Including Discontinued Operations, Restructuring Reserve

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- Definition

Restructuring and Related Cost, Expected Number of Positions Eliminated, Percent

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