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ACQUISITION - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 25, 2018
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Aggregate purchase price   $ 307,983 $ 0
Muuto Acquisition      
Business Acquisition [Line Items]      
Percentage of voting interests acquired 100.00%    
Aggregate purchase price $ 307,800    
Cash acquired from acquisition $ 7,600    
Muuto Acquisition | Selling, General and Administrative Expenses      
Business Acquisition [Line Items]      
Acquisition costs   $ 1,600