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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
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 $ 17,868,000 $ 17,170,000   $ 17,170,000  
Provision for estimated returns   3,949,000 $ 2,706,000 16,129,000 $ 12,367,000
Revenue from shipping and handling charges   1,890,000 $ 687,000 5,772,000 $ 2,290,000
Assets, fair value 24,330,000 $ 42,184,000   $ 42,184,000  
Common stock equivalents excluded from weighted average shares outstanding for diluted income per common share purposes (in Shares)   142 212 148 394
Payment for income taxes       $ 22,705,000 $ 11,900,000
Payment for interest       156,000 126,000
Non-cash capital additions       727,000 $ 897,000
Accounting Standards Update 2015-17 [Member]          
Significant Accounting Policies [Line Items]          
Adoption of new accounting standard impact in consolidated statements 1,642,000        
Accounting Standards Update 2016-09 [Member]          
Significant Accounting Policies [Line Items]          
Adoption of new accounting standard impact in consolidated statements   $ 1,007,000   3,714,000  
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)       11.00% 11.00%
Inventory Purchases [Member] | Major Supplier 2 [Member]          
Significant Accounting Policies [Line Items]          
Percent concentration risk (in Percent)       9.00% 12.00%
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 $ 740,000 $ 1,558,000   $ 1,558,000  
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)       98.00%  
Minimum [Member] | Retail Shipping Costs [Member] | Retail Shipping Provider [Member]          
Significant Accounting Policies [Line Items]          
Percent concentration risk (in Percent)       98.00%  
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