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ACQUISITION AND DIVESTITURE Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 12, 2018
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Business Acquisition [Line Items]          
Cash purchase price, net of cash acquired       $ 22,742 $ 0
Acquisition-related costs   $ 1,226 $ 0 1,683 $ 0
TMP          
Business Acquisition [Line Items]          
Cash purchase price, net of cash acquired $ 22,742        
Cash acquired from acquisition $ 7,000        
Acquisition-related costs   $ 1,226   $ 1,683