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Nature of Business and Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017:
 
Trade
Allowances
 
Rebates,
Chargebacks
and Discounts
 
Product
Returns
 
Other
Incentives
 
Total
 
(in thousands)
2017
 
 
 
 
 
 
 
 
 
Beginning Balance
$
2,568

 
$
81,927

 
$
3,492

 
$
1,214

 
$
89,201

Provision related to current period sales
25,892

 
176,996

 
4,038

 
15,595

 
222,521

Adjustments related to prior period sales
(189
)
 
(8,943
)
 
(13
)
 
(493
)
 
(9,638
)
Credits/payments made
(25,507
)
 
(137,765
)
 
(4,496
)
 
(11,633
)
 
(179,401
)
Ending Balance
$
2,764

 
$
112,215

 
$
3,021

 
$
4,683

 
$
122,683

 
 
 
 
 
 
 
 
 
 
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