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ACQUISITION (Details) - USD ($)
$ in Thousands
6 Months Ended
Jan. 25, 2018
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]      
Aggregate purchase price   $ 304,088 $ 0
Cash acquired from acquisition $ 7,500    
Muuto Acquisition      
Business Acquisition [Line Items]      
Percentage of voting interests acquired 100.00%    
Aggregate purchase price $ 303,700    
Muuto Acquisition | Selling, General and Administrative Expenses      
Business Acquisition [Line Items]      
Acquisition costs   $ 1,500