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, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
schedule of accrued liabilities [Line Items]          
Accrued salaries, bonus, vacation and other benefits $ 93,887   $ 97,492    
Accrued import duties 20,922   18,903    
Product warranties 14,466   13,186 $ 12,339 $ 11,455
Other 40,194   35,025    
Accrued liabilities, total 295,723 $ 329,865 275,684    
Allowance For Sales Returns And Miscellaneous Claims [Member]          
schedule of accrued liabilities [Line Items]          
Accrued liabilities, total $ 110,758   $ 97,702