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Product Revenues, Net (Tables)
 3 Months Ended
Mar. 31, 2017
Product Revenues [Abstract]  
Schedule of product revenue allowances and reserve categories
The following table summarizes activity in each of the product revenue allowance and reserve categories for the three months ended March 31, 2017:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
 
Other
Incentives
 
Total
 
(in thousands)
Balance at December 31, 2016
$
2,568

 
$
81,927

 
$
3,492

 
$
1,214

 
$
89,201

Provision related to current period sales
5,638

 
28,567

 
370

 
6,093

 
40,668

Adjustments related to prior period sales
(169
)
 
(2,344
)
 
(48
)
 
(56
)
 
(2,617
)
Credits/payments made
(5,654
)
 
(27,916
)
 
(170
)
 
(4,428
)
 
(38,168
)
Balance at March 31, 2017
$
2,383

 
$
80,234

 
$
3,644

 
$
2,823

 
$
89,084