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Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reserve for sales discounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Year $ 15,652 $ 13,488 $ 15,094
Net Charged to Costs and Expenses 91,082 82,724 77,126
Translations, Reclassifications and Acquisitions (48) 166 (109)
Net Write-Offs or Discounts Taken (88,563) (80,726) (78,623)
Balance End of Year 18,123 15,652 13,488
Reserve for inventory obsolescence      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Year 6,932 7,262 9,675
Net Charged to Costs and Expenses 3,773 3,007 2,041
Translations, Reclassifications and Acquisitions (116) 886 295
Net Write-Offs or Discounts Taken (3,395) (4,223) (4,749)
Balance End of Year 7,194 6,932 7,262
Reserve for warranty      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Year 5,335 5,262 5,566
Net Charged to Costs and Expenses 5,815 7,224 7,867
Translations, Reclassifications and Acquisitions (144) 567 (49)
Net Write-Offs or Discounts Taken (6,014) (7,718) (8,122)
Balance End of Year $ 4,992 $ 5,335 $ 5,262