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Product Revenues, Net (Tables)
 3 Months Ended
Mar. 31, 2014
Product Revenues [Abstract]  
Schedule of product revenues and 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, 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
2,489

 
16,160

 
349

 
600

 
19,598

Adjustments related to prior period sales
(10
)
 
4,170

 
2,205

 
1

 
6,366

Credits/payments made
(3,128
)
 
(34,006
)
 
(3,311
)
 
(995
)
 
(41,440
)
Balance at March 31, 2014
$
886

 
$
54,568

 
$
15,042

 
$
1,161

 
$
71,657