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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Sales Returns and Exchanges (Tables)
 12 Months Ended
Dec. 31, 2017
Allowance for sales returns and exchanges [Abstract]  
Allowance for Sales Returns and Exchanges [Table Text Block]

The following table sets forth the activity in the allowance for sales returns and exchanges for the years ended December 31, 2017, 2016 and 2015 (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Allowance for sales returns and exchanges – beginning of year
$
7,861

 
$
8,583

 
$
9,510

Additions and adjustments to the allowance
14,494

 
9,325

 
8,468

Deductions against the allowance
(12,439
)
 
(10,047
)
 
(9,395
)
Allowance for sales returns and exchanges – end of year
$
9,916

 
$
7,861

 
$
8,583