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Product Revenues, Net (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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
18,776

 
118,592

 
3,603

 
12,238

 
153,209

Adjustments related to prior period sales
(188
)
 
(4,327
)
 
(13
)
 
(355
)
 
(4,883
)
Credits/payments made
(18,409
)
 
(97,393
)
 
(1,809
)
 
(10,021
)
 
(127,632
)
Balance at September 30, 2017
$
2,747

 
$
98,799

 
$
5,273

 
$
3,076

 
$
109,895