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Allowance for Doubtful Accounts, Sales Returns and Discounts (Tables)
 12 Months Ended
Dec. 31, 2014
Allowance For Doubtful Accounts Sales Returns And Discounts [Abstract]  
Schedule Of Allowance For Doubtful Accounts, Sales Returns And Discounts [Table Text Block]
The activity in the allowance for doubtful accounts, sales returns and discounts for the years ended December 31, 2012, 2013 and 2014 follows:
 
Allowance for doubtful accounts
 
Period
 
 
Balance at
beginning
of year
 
Charges to
earnings
 
Amounts
utilized
 
Balance at
end of
year
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year 2012
 
$
15,186
 
 
-
 
 
-
 
 
15,186
 
Year 2013
 
$
15,186
 
 
173
 
 
-
 
 
15,359
 
Year 2014
 
$
15,359
 
 
554
 
 
(15,186)
 
 
727
 
 
Allowance for sales returns and discounts
 
Period
 
Balance at
beginning
of year
 
Additions
 
Amounts
utilized
 
Balance at
end of
year
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year 2012
 
$
785
 
 
7,386
 
 
(7,093)
 
 
1,078
 
Year 2013
 
$
1,078
 
 
7,272
 
 
(7,421)
 
 
929
 
Year 2014
 
$
929
 
 
5,168
 
 
(5,229)
 
 
868