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Product Revenues, Net (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
 
Other
Incentives
 
Total
 
(in thousands)
Balance at December 31, 2013
$
1,535

 
$
68,244

 
$
15,799

 
$
1,555

 
$
87,133

Provision related to current period sales
6,772

 
30,720

 
1,691

 
1,210

 
40,393

Adjustments related to prior period sales
(8
)
 
5,052

 
(2,778
)
 
(72
)
 
2,194

Credits/payments made
(7,255
)
 
(67,557
)
 
(6,052
)
 
(1,808
)
 
(82,672
)
Balance at September 30, 2014
$
1,044

 
$
36,459

 
$
8,660

 
$
885

 
$
47,048