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Accrued Liabilities Accrued rebates, chargebacks and other revenue reserves (Tables)
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Sales Allowances and Accruals Rollforward [Table Text Block]
The following table provides a summary of activity with respect to our sales allowances and accruals for the year ended December 31, 2017:
(in thousands)
 
Discount and Distribution Fees
 
Government Rebates and Chargebacks
 
Assistance and Other Discounts
 
Product Return
 
Total
Balance at January 1, 2017:
 
$
2,475

 
$
5,514

 
$
2,580

 
$
1,769

 
$
12,338

Allowances for current period sales
 
8,952

 
19,541

 
8,934

 
3,691

 
41,118

Allowances for prior period sales
 
—

 
253

 
—

 
—

 
253

Credits/payments for current period sales
 
(5,530
)
 
(10,823
)
 
(5,256
)
 
(1,145
)
 
(22,754
)
Credits/payments for prior period sales
 
(2,475
)
 
(5,776
)
 
(2,080
)
 
(1,011
)
 
(11,342
)
Balance at December 31, 2017
 
$
3,422

 
$
8,709

 
$
4,178

 
$
3,304

 
$
19,613