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Nature of Business and Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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 three years ended December 31, 2016:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
 
Other
Incentives
 
Total
 
(in thousands)
2016
 
 
 
 
 
 
 
 
 
Beginning Balance
$
2,089

 
$
44,669

 
$
1,228

 
$
1,310

 
$
49,296

Provision related to current period sales
20,075

 
134,198

 
3,047

 
6,602

 
163,922

Adjustments related to prior period sales
(90
)
 
154

 
(17
)
 
(151
)
 
(104
)
Credits/payments made
(19,506
)
 
(97,094
)
 
(766
)
 
(6,547
)
 
(123,913
)
Ending Balance
$
2,568

 
$
81,927

 
$
3,492

 
$
1,214

 
$
89,201

 
 
 
 
 
 
 
 
 
 
2015
 
 
 
 
 
 
 
 
 
Beginning Balance
$
1,463

 
$
29,102

 
$
4,713

 
$
745

 
$
36,023

Provision related to current period sales
10,890

 
65,781

 
779

 
3,755

 
81,205

Adjustments related to prior period sales
(214
)
 
(19,410
)
 
(993
)
 
(235
)
 
(20,852
)
Credits/payments made
(10,050
)
 
(30,804
)
 
(3,271
)
 
(2,955
)
 
(47,080
)
Ending Balance
$
2,089

 
$
44,669

 
$
1,228

 
$
1,310

 
$
49,296

 
 
 
 
 
 
 
 
 
 
2014
 
 
 
 
 
 
 
 
 
Beginning Balance
$
1,535

 
$
68,244

 
$
15,799

 
$
1,555

 
$
87,133

Provision related to current period sales
8,468

 
35,713

 
2,478

 
1,347

 
48,006

Adjustments related to prior period sales
(43
)
 
329

 
3,056

 
(72
)
 
3,270

Credits/payments made
(8,497
)
 
(75,184
)
 
(16,620
)
 
(2,085
)
 
(102,386
)
Ending Balance
$
1,463

 
$
29,102

 
$
4,713

 
$
745

 
$
36,023