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Product Revenues, Net (Tables)
 3 Months Ended
Mar. 31, 2013
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, 2013:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
 
Other
Incentives
 
Total
 
(in thousands)
Balance at December 31, 2012
$
5,416

 
$
63,560

 
$
2,852

 
$
3,565

 
$
75,393

Provision related to current period sales
11,226

 
52,334

 
872

 
3,720

 
68,152

Adjustments related to prior period sales
107

 
1,644

 
8,209

 
(138
)
 
9,822

Credits/payments made
(11,728
)
 
(51,132
)
 
(1,009
)
 
(3,883
)
 
(67,752
)
Balance at March 31, 2013
$
5,021

 
$
66,406

 
$
10,924

 
$
3,264

 
$
85,615