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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Significant Accounting Policies [Line Items]            
Percentage of parent and wholly-owned subsidiaries assets and liabilities included in financial statements (in Percent)     100.00%      
Net book value of capitalized software $ 14,423,000   $ 14,423,000     $ 16,419,000
Revenue from shipping and handling charges 159,255,000 $ 158,149,000 561,496,000 $ 565,720,000    
Provision for estimated returns 4,400,000 $ 3,949,000 15,145,000 $ 16,129,000    
Assets, fair value $ 68,604,000   $ 68,604,000     47,768,000
Common stock equivalents excluded from weighted average shares outstanding for diluted income per common share purposes (in Shares) 152 142 176 148    
Payment for income taxes     $ 6,267,000 $ 22,705,000    
Payment for interest     142,000 156,000    
Non-cash capital additions     911,000 $ 727,000    
Level 2 [Member]            
Significant Accounting Policies [Line Items]            
Assets, fair value $ 0   0     0
Level 3 [Member]            
Significant Accounting Policies [Line Items]            
Assets, fair value 0   $ 0     0
Inventory Purchases [Member] | Major Supplier 1 [Member]            
Significant Accounting Policies [Line Items]            
Percent concentration risk (in Percent)     10.00% 7.00%    
Inventory Purchases [Member] | Major Supplier 2 [Member]            
Significant Accounting Policies [Line Items]            
Percent concentration risk (in Percent)     9.00% 11.00%    
Fulfillment Cost [Member] | Third Party Fulfillment Provider Concentration [Member]            
Significant Accounting Policies [Line Items]            
Percent concentration risk (in Percent)     100.00%      
Allowance for Sales Returns [Member]            
Significant Accounting Policies [Line Items]            
Returns reserve balance 1,210,000   $ 1,210,000     $ 868,000
Shipping and Handling [Member]            
Significant Accounting Policies [Line Items]            
Revenue from shipping and handling charges $ 4,141,000 $ 1,890,000 $ 12,865,000 $ 5,772,000    
Minimum [Member]            
Significant Accounting Policies [Line Items]            
Estimated useful life (in Duration)     2 years      
Minimum [Member] | Direct Shipping Cost [Member] | Direct Shipping Provider [Member]            
Significant Accounting Policies [Line Items]            
Percent concentration risk (in Percent)     97.00%      
Minimum [Member] | Retail Shipping Costs [Member] | Retail Shipping Provider [Member]            
Significant Accounting Policies [Line Items]            
Percent concentration risk (in Percent)     97.00%      
Minimum [Member] | Internal-Use Software and Website Development [Member]            
Significant Accounting Policies [Line Items]            
Estimated useful life (in Duration)     2 years      
Maximum [Member]            
Significant Accounting Policies [Line Items]            
Estimated useful life (in Duration)     7 years      
Maximum [Member] | Internal-Use Software and Website Development [Member]            
Significant Accounting Policies [Line Items]            
Estimated useful life (in Duration)     5 years      
Available-for-sale Securities [Member] | Government and Agency Securities and Corporate Debt Securities [Member] | Minimum [Member]            
Significant Accounting Policies [Line Items]            
Short term investments original maturities period     3 months      
Available-for-sale Securities [Member] | Government and Agency Securities and Corporate Debt Securities [Member] | Maximum [Member]            
Significant Accounting Policies [Line Items]            
Short term investments original maturities period     3 years      
ASC 606 [Member]            
Significant Accounting Policies [Line Items]            
Increase in stockholder's equity         $ 1,135,000