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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of accrued liabilities Accrued liabilities consisted of the following: 
 
December 31,
(in thousands)
2018
 
2017
Sales incentive and advertising accruals
$
36,312

 
$
31,143

Vacation liability
2,901

 
8,993

Dividend payable
10,024

 
9,954

Labor related liabilities
22,365

 
20,196

Sales taxes payable and other
26,970

 
18,199


$
98,572

 
$
88,485