Income Taxes (Summary Of Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Working capital	$ 4,082	$ 1,518
Property, plant and equipment	5,236	4,287
Goodwill	286	447
Stock option compensation	3,243	1,635
Unused tax losses	17,079	20,798
Other	14,704	18,061
Deferred tax assets	44,630	46,746
Property, plant and equipment	(11,292)	(14,255)
Goodwill	(12,587)	(12,549)
Intangible assets	(9,370)	(7,425)
Other	(17,308)	(17,812)
Deferred tax liabilities	(50,557)	(52,041)
Net deferred tax assets (liabilities)	(5,927)	(5,295)
Valuation allowance	(11,781)	(18,906)
Total Deferred Tax Assets (Liabilities)	$ (17,708)	$ (24,201)