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Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule of Allowance for Ship and Debit [Table Text Block]
ollowing is a summary of the activity in the allowance for ship and debit credits:
(in thousands)
Balance at Beginning of Period
 
Charged to Costs and Expenses
 
Deductions(1)
 
Balance at End of Period
Allowance for ship and debit credits:
 
 
 
 
 
 
 
Year ended December 31, 2016
$
34,415

 
$
262,501

 
$
(258,841
)
 
$
38,075

Year ended December 31, 2017
$
38,075

 
$
273,492

 
$
(272,081
)
 
$
39,486

Year ended December 31, 2018
$
39,486

 
$
242,068

 
$
(241,436
)
 
$
40,118


_______________
(1)
Deductions relate to ship and debit credits issued which adjust the sales price from the standard distribution price to the pre-approved lower price. Refer to Note 2, Significant Accounting Policies and Recent Accounting Pronouncements, for the Company’s revenue recognition policy, including the Company’s accounting for ship and debit claims.