Fair Value Measurements And Derivative Instruments (Schedule Of Realized (Gains) Losses On Derivatives Recognized In Statement Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives designated as cash flow hedges: | Commodity Forward Derivatives [Member] | Recorded in Cost of Sales
Derivatives, Fair Value [Line Items]
Amount of (Gain)/Loss Recognized	$ (8,892)	$ (919)	$ 0
Derivatives designated as cash flow hedges: | Interest rate swap | Interest Expense
Derivatives, Fair Value [Line Items]
Amount of (Gain)/Loss Recognized	(1,050)	0	0
Derivatives not designated as hedges: | Foreign currency derivatives | Cost Of Good Sold Other Expense Income [Member]
Derivatives, Fair Value [Line Items]
Amount of (Gain)/Loss Recognized	(506)	(522)	(1,565)
Derivatives not designated as hedges: | Commodity Contract [Member] | Interest Expense
Derivatives, Fair Value [Line Items]
Amount of (Gain)/Loss Recognized	$ (223)	$ 0	$ 0