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Accrued Liabilities (Tables)
 9 Months Ended
Sep. 30, 2017
Sales Allowances and Accruals [Abstract]  
Sales Allowances and Accruals [Table Text Block]
The following table provides a summary of activity with respect to the Company’s sales allowances and accruals for the nine months ended September 30, 2017:
(in thousands)
 
Discount and Distribution Fees
 
Government Rebates and Chargebacks
 
Assistance and Other Discounts
 
Product Return
 
Total
Balance at December 31, 2016:
 
$
2,475

 
$
5,514

 
$
2,580

 
$
1,769

 
$
12,338

Allowances for current period sales
 
6,565

 
14,455

 
6,625

 
3,054

 
30,699

Allowances for prior period sales
 
—

 
253

 
—

 
—

 
253

Credits/payments for current period sales
 
(3,048
)
 
(4,720
)
 
(4,435
)
 
(1,145
)
 
(13,348
)
Credits/payments for prior period sales
 
(2,425
)
 
(4,353
)
 
(1,488
)
 
(1,024
)
 
(9,290
)
Balance at September 30, 2017:
 
$
3,567

 
$
11,149

 
$
3,282

 
$
2,654

 
$
20,652