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Nature of Business and Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]  
Schedule of product revenues allowances and reserve categories
The following table summarizes activity in each of the product revenue allowance and reserve categories for the years ended December 31, 2012 and 2011:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
Other
Incentives
Total
 
(in thousands)
2012
 
 
 
 
 
 
 
Beginning Balance
$
11,162

 
$
52,659

 
$
340

$
5,202

$
69,363

Provision related to current period sales
55,913

 
216,942

 
2,067

19,103

294,025

Adjustments related to prior period sales
29

 
3,883

 
1,498

72

5,482

Credits/payments made
(61,688
)
 
(209,924
)
 
(1,053
)
(20,812
)
(293,477
)
Ending Balance
$
5,416

 
$
63,560

 
$
2,852

$
3,565

$
75,393

 
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
Beginning Balance
$
—

 
$
—

 
$
—

$
—

$
—

Provision related to current period sales
38,228

 
75,145

 
553

9,692

123,618

Credits/payments made
(27,066
)
 
(22,486
)
 
(213
)
(4,490
)
(54,255
)
Ending Balance
$
11,162

 
$
52,659

 
$
340

$
5,202

$
69,363