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Product Revenues, Net (Tables)
 3 Months Ended
Mar. 31, 2016
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 three months ended March 31, 2016:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
 
Other
Incentives
 
Total
 
(in thousands)
Balance at December 31, 2015
$
2,089

 
$
44,669

 
$
1,228

 
$
1,310

 
$
49,296

Provision related to current period sales
4,707

 
31,138

 
924

 
3,280

 
40,049

Adjustments related to prior period sales
(38
)
 
(2,181
)
 
(75
)
 
—

 
(2,294
)
Credits/payments made
(4,698
)
 
(19,132
)
 
(260
)
 
(3,281
)
 
(27,371
)
Balance at March 31, 2016
$
2,060

 
$
54,494

 
$
1,817

 
$
1,309

 
$
59,680