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INCOME TAXES (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 29, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Uncertain Tax Benefits
Gross unrecognized tax benefits	$ 27,900,000			$ 27,900,000
Net unrecognized tax benefits	19,800,000			19,800,000
Net unrecognized tax benefits that would impact effective tax rate if recognized	16,100,000			16,100,000
Gross accrued interest	4,800,000			4,800,000
Net accrued interest	3,700,000			3,700,000
Penalties recorded				0
Other Tax Matters
Income tax provision	(1,700,000)		$ (4,800,000)	(6,200,000)	$ (14,000,000)
Pre-tax income (loss) from continuing operations	$ 8,500,000		$ 26,800,000	$ 45,100,000	$ 38,000,000
Effective income tax rate (as a percent)	20.00%		17.90%	13.70%	36.80%
Benefit for excess tax benefits related to stock compensation awards				$ 1,000,000
Income tax expense				1,700,000
Tax Cuts and Jobs Act of 2017, provisional charges		$ 11,800,000
Tax charges related to the Tax Cuts and Jobs Act of 2017				900,000
Accounting Standards Update 2016-09
Other Tax Matters
Benefit for excess tax benefits related to stock compensation awards			$ 4.1		$ 4,100,000
Maximum
Uncertain Tax Benefits
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, high end of range	$ 10,000,000			$ 10,000,000
Foreign
Other Tax Matters
Foreign losses generated for which no tax benefit was recognized			$ 5,000,000		$ 34,600,000

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