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Revenue Recognition Impact of ASC 606 on Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Sales Revenue, Goods, Net $ 310,204 $ 305,907
Sales Revenue, Services, Net 39,433 0
Net sales 349,637 305,907
Cost of Goods Sold 145,493 122,889
Cost of Services 14,604 0
Cost of Goods and Services Sold 160,097  
Gross Profit $ 189,540 183,018
Gross Profit, Percentage 54.20%  
Selling Expense $ 87,642 98,025
General and Administrative Expense 92,688 80,479
Operating Expenses 180,330 $ 173,082
Calculated under Revenue Guidance in Effect before Topic 606    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Sales Revenue, Goods, Net 349,587  
Sales Revenue, Services, Net 0  
Net sales 349,587  
Cost of Goods Sold 145,493  
Cost of Services 0  
Cost of Goods and Services Sold 145,493  
Gross Profit $ 204,094  
Gross Profit, Percentage 58.40%  
Selling Expense $ 102,140  
General and Administrative Expense 92,688  
Operating Expenses 194,828  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Sales Revenue, Goods, Net 39,383  
Sales Revenue, Services, Net (39,433)  
Net sales (50)  
Cost of Goods Sold 0  
Cost of Services (14,604)  
Cost of Goods and Services Sold (14,604)  
Gross Profit 14,554  
Selling Expense 14,498  
General and Administrative Expense 0  
Operating Expenses $ 14,498