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INCOME TAXES (Details) - USD ($)
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Uncertain Tax Benefits    
Gross unrecognized tax benefits $ 20,300,000  
Net unrecognized tax benefits 13,900,000  
Net unrecognized tax benefits that would impact effective tax rate if recognized 10,200,000  
Gross accrued interest 4,100,000  
Net accrued interest 3,100,000  
Penalties accrued 0  
Other Tax Matters    
Income tax provision (4,600,000) $ (4,100,000)
Pre-tax income (loss) from continuing operations $ 5,200,000 $ 16,500,000
Effective income tax rate (as a percent) 88.50% 24.80%
Excess tax benefits from stock-based compensation awards vested $ 1,200,000 $ 800,000
Tax Cuts and Jobs Act of 2017, provisional charges   $ 1,500,000
Maximum    
Uncertain Tax Benefits    
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, high end of range $ 4,000,000