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Product Revenues, Net (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 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
4,513

 
26,464

 
379

 
859

 
32,215

Adjustments related to prior period sales
(8
)
 
3,861

 
4,124

 
1

 
7,978

Credits/payments made
(5,271
)
 
(57,617
)
 
(4,160
)
 
(1,586
)
 
(68,634
)
Balance at June 30, 2014
$
769

 
$
40,952

 
$
16,142

 
$
829

 
$
58,692