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Accrued Liabilities (Tables)
 3 Months Ended
Mar. 31, 2019
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 three months ended March 31, 2019:
(in thousands)
 
Discount and Distribution Fees
 
Government Rebates and Chargebacks
 
Assistance and Other Discounts
 
Product Returns
 
Total
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2018
 
$
3,094

 
$
8,901

 
$
3,457

 
$
4,681

 
$
20,133

Allowances for current period sales
 
2,173

 
4,396

 
1,974

 
554

 
9,097

Allowances for prior period sales
 
—

 
1,841

 
120

 
—

 
1,961

Credits/payments for current period sales
 
(351
)
 
(1,028
)
 
(546
)
 
(31
)
 
(1,956
)
Credits/payments for prior period sales
 
(2,483
)
 
(7,972
)
 
(2,887
)
 
(1,057
)
 
(14,399
)
Balance at March 31, 2019
 
$
2,433

 
$
6,138

 
$
2,118

 
$
4,147

 
$
14,836