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Accrued Liabilities (Tables)
 6 Months Ended
Jun. 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 six months ended June 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
 
4,478

 
9,859

 
4,519

 
2,465

 
21,321

Allowances for prior period sales
 
—

 
253

 
—

 
—

 
253

Credits/payments for current period sales
 
(2,062
)
 
(1,853
)
 
(126
)
 
(1,145
)
 
(5,186
)
Credits/payments for prior period sales
 
(2,425
)
 
(4,334
)
 
(785
)
 
(1,925
)
 
(9,469
)
Balance at June 30, 2017:
 
$
2,466

 
$
9,439

 
$
6,188

 
$
1,164

 
$
19,257