Acquisitions (Schedule Of Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Feb. 15, 2017	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Goodwill		$ 81,404	$ 128,208
Futura Industries [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Accounts receivable	$ 6,680
Inventories	10,342
Property, plant & equipment	32,662
Total identifiable net assets	72,489
Prepaid Expense and Other Assets	240
Current Liabilities	(8,135)
Business Combination, Consideration Transferred	82,860
Futura Industries [Member] | Goodwill [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Goodwill	10,371
Futura Industries [Member] | Customer relationships
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Identifiable finite-lived intangible assets	24,000
Futura Industries [Member] | Trade Names [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Identifiable finite-lived intangible assets	$ 6,700