Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Schedule of Accrued Liabilities) (Details)

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Accrued Liabilities (Schedule of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
schedule of accrued liabilities [Line Items]        
Accrued salaries, bonus, vacation and other benefits $ 80,074 $ 93,887    
Accrued import duties 18,522 20,922    
Accrual for Taxes Other than Income Taxes 15,002 15,496    
Product warranties 14,745 14,466 $ 13,186 $ 12,339
Other 45,760 40,194    
Accrued liabilities, total 257,278 295,723    
Allowance For Sales Returns And Miscellaneous Claims [Member]        
schedule of accrued liabilities [Line Items]        
Accrued liabilities, total $ 83,175 $ 110,758