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ACQUISITIONS - Narrative (Details) - USD ($)
12 Months Ended
Jan. 25, 2018
Dec. 01, 2016
Sep. 09, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Purchase price for acquisition       $ 307,983,000 $ 0 $ 18,456,000
Holly Hunt            
Business Acquisition [Line Items]            
Purchase price     $ 8,500,000      
DatesWeiser            
Business Acquisition [Line Items]            
Purchase price   $ 11,000,000        
DatesWeiser | Fair Value, Measurements, Recurring            
Business Acquisition [Line Items]            
Fair value of contingent purchase price payment (up to)   $ 4,000,000.0   750,000 $ 1,100,000  
Muuto Acquisition            
Business Acquisition [Line Items]            
Purchase price $ 315,313,000          
Percentage of voting interests acquired 100.00%          
Purchase price for acquisition $ 307,700,000          
Cash acquired from acquisition $ 7,600,000          
Selling, general, and administrative expenses | Muuto Acquisition            
Business Acquisition [Line Items]            
Acquisition costs       $ 5,100,000