Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reserve for sales discounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year	$ 16,883	$ 18,123	$ 15,652
Net Charged to Costs and Expenses	93,398	91,962	91,082
Translations, Reclassifications and Acquisitions	15	39	(48)
Net Write-Offs or Discounts Taken	(96,747)	(93,241)	(88,563)
Balance End of Year	13,549	16,883	18,123
Reserve for inventory obsolescence
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year	8,233	7,194	6,932
Net Charged to Costs and Expenses	4,609	5,711	3,773
Translations, Reclassifications and Acquisitions	1,471	6,467	(116)
Net Write-Offs or Discounts Taken	(2,286)	(11,139)	(3,395)
Balance End of Year	12,027	8,233	7,194
Reserve for warranty
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year	10,249	4,992	5,335
Net Charged to Costs and Expenses	8,466	8,273	5,815
Translations, Reclassifications and Acquisitions	247	4,343	(144)
Net Write-Offs or Discounts Taken	(9,866)	(7,359)	(6,014)
Balance End of Year	$ 9,096	$ 10,249	$ 4,992