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Product Revenues, Net (Tables)
 6 Months Ended
Jun. 30, 2017
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 six months ended June 30, 2017:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
 
Other
Incentives
 
Total
 
(in thousands)
Balance at December 31, 2016
$
2,568

 
$
81,927

 
$
3,492

 
$
1,214

 
$
89,201

Provision related to current period sales
11,941

 
69,669

 
1,777

 
9,224

 
92,611

Adjustments related to prior period sales
(194
)
 
(3,268
)
 
(48
)
 
(145
)
 
(3,655
)
Credits/payments made
(11,683
)
 
(58,121
)
 
(631
)
 
(6,966
)
 
(77,401
)
Balance at June 30, 2017
$
2,632

 
$
90,207

 
$
4,590

 
$
3,327

 
$
100,756