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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Showroom
State
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]      
Number of showrooms | Showroom 124    
Number of states | State 16    
Cash and Cash Equivalents [Abstract]      
Period of settlement for amounts due from third-party financial institutions for credit and debit card transactions 5 days    
Other Income, net [Abstract]      
Insurance recovery receivable     $ 0
Gains on insurance recovery $ 2,848 $ 3,338 0
Gain on sale of former retail location 525 700  
Settlement related to credit card litigation 800    
Revenue Recognition [Abstract]      
Delivery fees 25,728 25,467 27,650
Deliveries expense 39,582 39,222 37,730
Selling, General and Administrative Expenses [Abstract]      
Purchasing, warehousing, delivery and other distribution costs 77,368 77,266 73,803
Deferred Escalating Minimum Rent and Lease Incentives [Abstract]      
Liability for deferred escalating minimum rent 8,565 8,797  
Lease incentives 1,139 676  
Advertising Expense [Abstract]      
Prepaid advertising cost 602 324  
Advertising expense 47,921 45,132 45,784
Interest Expense, net [Abstract]      
Interest expense 2,512 2,568 2,615
Self-Insurance [Abstract]      
Self-insurance reserves 8,975 9,095  
Fair Values of Financial Instruments [Abstract]      
Deferred compensation plans $ 5,986 $ 4,410  
Earnings Per Share [Abstract]      
Percentage of earnings or losses assumed in calculation 100.00% 100.00%  
Accumulated Other Comprehensive Income (Loss) [Abstract]      
Accumulated other comprehensive (loss) $ (2,144) $ (1,830)  
Other Expenses [Member]      
Other Income, net [Abstract]      
Gains on insurance recovery   1,110  
Hurricane Irma [Member]      
Other Income, net [Abstract]      
Gains on insurance recovery 1,500    
Buildings [Member]      
Other Income, net [Abstract]      
Gains on insurance recovery $ 1,351 2,228  
Buildings [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 25 years    
Buildings [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 33 years    
Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 5 years    
Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 15 years    
Furniture and Fixtures [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 3 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 15 years    
Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 3 years    
Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 15 years    
Buildings under Lease [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life of property and equipment 15 years    
ASU 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Excess tax (cost) benefit related to stock-based plans   $ (121) $ 253
ASU 2014-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect on adoption method in increasing retained earnings $ 130