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DERIVATIVE FINANCIAL INSTRUMENTS (Details)
lb in Millions
9 Months Ended 12 Months Ended
Sep. 29, 2018
USD ($)
lb
Dec. 31, 2017
USD ($)
lb
Jul. 02, 2016
Interest Rate Swap, Through December 2021      
Derivative Financial Instruments      
Unrealized gain (losses), net of tax, recorded in AOCI $ 200,000    
Interest Rate Swap, Through December 2021 | Derivative contracts designated as hedging instruments      
Derivative Financial Instruments      
Aggregate notional amount 260,000,000    
Long-term asset to recognize fair value of swaps 300,000    
Interest Rate Swap, Through December 2021 | Derivative contracts designated as hedging instruments | Term loan      
Derivative Financial Instruments      
Fixed rate (percentage)     2.535%
FX Forward Contracts      
Derivative Financial Instruments      
Aggregate notional amount 14,200,000 $ 9,000,000  
Unrealized gain (losses), net of tax, recorded in AOCI 0 0  
FX embedded derivatives | Derivative contracts not designated as hedging instruments      
Derivative Financial Instruments      
Aggregate notional amount 600,000 1,100,000  
Commodity Contracts      
Derivative Financial Instruments      
Unrealized gain (losses), net of tax, recorded in AOCI (500,000) 800,000  
Fair value of derivative contract - liability $ 700,000    
Fair value of derivative contract - current asset   $ 1,100,000  
Commodity Contracts | Derivative contracts designated as hedging instruments      
Derivative Financial Instruments      
Notional amount of commodity contracts (in pounds of copper) | lb 3.9 3.6